1 /******************************************************************************* 2 * Filename: target_core_pr.c 3 * 4 * This file contains SPC-3 compliant persistent reservations and 5 * legacy SPC-2 reservations with compatible reservation handling (CRH=1) 6 * 7 * Copyright (c) 2009, 2010 Rising Tide Systems 8 * Copyright (c) 2009, 2010 Linux-iSCSI.org 9 * 10 * Nicholas A. Bellinger <nab@kernel.org> 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 25 * 26 ******************************************************************************/ 27 28 #include <linux/slab.h> 29 #include <linux/spinlock.h> 30 #include <linux/list.h> 31 #include <scsi/scsi.h> 32 #include <scsi/scsi_cmnd.h> 33 #include <asm/unaligned.h> 34 35 #include <target/target_core_base.h> 36 #include <target/target_core_backend.h> 37 #include <target/target_core_fabric.h> 38 #include <target/target_core_configfs.h> 39 40 #include "target_core_internal.h" 41 #include "target_core_pr.h" 42 #include "target_core_ua.h" 43 44 /* 45 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) 46 */ 47 struct pr_transport_id_holder { 48 int dest_local_nexus; 49 struct t10_pr_registration *dest_pr_reg; 50 struct se_portal_group *dest_tpg; 51 struct se_node_acl *dest_node_acl; 52 struct se_dev_entry *dest_se_deve; 53 struct list_head dest_list; 54 }; 55 56 int core_pr_dump_initiator_port( 57 struct t10_pr_registration *pr_reg, 58 char *buf, 59 u32 size) 60 { 61 if (!pr_reg->isid_present_at_reg) 62 return 0; 63 64 snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]); 65 return 1; 66 } 67 68 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, 69 struct t10_pr_registration *, int); 70 71 static int core_scsi2_reservation_seq_non_holder( 72 struct se_cmd *cmd, 73 unsigned char *cdb, 74 u32 pr_reg_type) 75 { 76 switch (cdb[0]) { 77 case INQUIRY: 78 case RELEASE: 79 case RELEASE_10: 80 return 0; 81 default: 82 return 1; 83 } 84 85 return 1; 86 } 87 88 static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type) 89 { 90 struct se_device *dev = cmd->se_dev; 91 struct se_session *sess = cmd->se_sess; 92 int ret; 93 94 if (!sess) 95 return 0; 96 97 spin_lock(&dev->dev_reservation_lock); 98 if (!dev->dev_reserved_node_acl || !sess) { 99 spin_unlock(&dev->dev_reservation_lock); 100 return 0; 101 } 102 if (dev->dev_reserved_node_acl != sess->se_node_acl) { 103 spin_unlock(&dev->dev_reservation_lock); 104 return -EINVAL; 105 } 106 if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) { 107 spin_unlock(&dev->dev_reservation_lock); 108 return 0; 109 } 110 ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -EINVAL; 111 spin_unlock(&dev->dev_reservation_lock); 112 113 return ret; 114 } 115 116 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, 117 struct se_node_acl *, struct se_session *); 118 static void core_scsi3_put_pr_reg(struct t10_pr_registration *); 119 120 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) 121 { 122 struct se_session *se_sess = cmd->se_sess; 123 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; 124 struct t10_pr_registration *pr_reg; 125 struct t10_reservation *pr_tmpl = &su_dev->t10_pr; 126 int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS); 127 int conflict = 0; 128 129 if (!crh) 130 return -EINVAL; 131 132 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 133 se_sess); 134 if (pr_reg) { 135 /* 136 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE 137 * behavior 138 * 139 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD 140 * status, but no reservation shall be established and the 141 * persistent reservation shall not be changed, if the command 142 * is received from a) and b) below. 143 * 144 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD 145 * status, but the persistent reservation shall not be released, 146 * if the command is received from a) and b) 147 * 148 * a) An I_T nexus that is a persistent reservation holder; or 149 * b) An I_T nexus that is registered if a registrants only or 150 * all registrants type persistent reservation is present. 151 * 152 * In all other cases, a RESERVE(6) command, RESERVE(10) command, 153 * RELEASE(6) command, or RELEASE(10) command shall be processed 154 * as defined in SPC-2. 155 */ 156 if (pr_reg->pr_res_holder) { 157 core_scsi3_put_pr_reg(pr_reg); 158 return 1; 159 } 160 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 161 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || 162 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 163 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 164 core_scsi3_put_pr_reg(pr_reg); 165 return 1; 166 } 167 core_scsi3_put_pr_reg(pr_reg); 168 conflict = 1; 169 } else { 170 /* 171 * Following spc2r20 5.5.1 Reservations overview: 172 * 173 * If a logical unit has executed a PERSISTENT RESERVE OUT 174 * command with the REGISTER or the REGISTER AND IGNORE 175 * EXISTING KEY service action and is still registered by any 176 * initiator, all RESERVE commands and all RELEASE commands 177 * regardless of initiator shall conflict and shall terminate 178 * with a RESERVATION CONFLICT status. 179 */ 180 spin_lock(&pr_tmpl->registration_lock); 181 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; 182 spin_unlock(&pr_tmpl->registration_lock); 183 } 184 185 if (conflict) { 186 pr_err("Received legacy SPC-2 RESERVE/RELEASE" 187 " while active SPC-3 registrations exist," 188 " returning RESERVATION_CONFLICT\n"); 189 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 190 return -EBUSY; 191 } 192 193 return 0; 194 } 195 196 int target_scsi2_reservation_release(struct se_cmd *cmd) 197 { 198 struct se_device *dev = cmd->se_dev; 199 struct se_session *sess = cmd->se_sess; 200 struct se_portal_group *tpg = sess->se_tpg; 201 int ret = 0, rc; 202 203 if (!sess || !tpg) 204 goto out; 205 rc = target_check_scsi2_reservation_conflict(cmd); 206 if (rc == 1) 207 goto out; 208 else if (rc < 0) { 209 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 210 ret = -EINVAL; 211 goto out; 212 } 213 214 ret = 0; 215 spin_lock(&dev->dev_reservation_lock); 216 if (!dev->dev_reserved_node_acl || !sess) 217 goto out_unlock; 218 219 if (dev->dev_reserved_node_acl != sess->se_node_acl) 220 goto out_unlock; 221 222 if (dev->dev_res_bin_isid != sess->sess_bin_isid) 223 goto out_unlock; 224 225 dev->dev_reserved_node_acl = NULL; 226 dev->dev_flags &= ~DF_SPC2_RESERVATIONS; 227 if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) { 228 dev->dev_res_bin_isid = 0; 229 dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID; 230 } 231 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->" 232 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 233 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 234 sess->se_node_acl->initiatorname); 235 236 out_unlock: 237 spin_unlock(&dev->dev_reservation_lock); 238 out: 239 if (!ret) 240 target_complete_cmd(cmd, GOOD); 241 return ret; 242 } 243 244 int target_scsi2_reservation_reserve(struct se_cmd *cmd) 245 { 246 struct se_device *dev = cmd->se_dev; 247 struct se_session *sess = cmd->se_sess; 248 struct se_portal_group *tpg = sess->se_tpg; 249 int ret = 0, rc; 250 251 if ((cmd->t_task_cdb[1] & 0x01) && 252 (cmd->t_task_cdb[1] & 0x02)) { 253 pr_err("LongIO and Obselete Bits set, returning" 254 " ILLEGAL_REQUEST\n"); 255 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; 256 ret = -EINVAL; 257 goto out; 258 } 259 /* 260 * This is currently the case for target_core_mod passthrough struct se_cmd 261 * ops 262 */ 263 if (!sess || !tpg) 264 goto out; 265 rc = target_check_scsi2_reservation_conflict(cmd); 266 if (rc == 1) 267 goto out; 268 else if (rc < 0) { 269 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 270 ret = -EINVAL; 271 goto out; 272 } 273 274 ret = 0; 275 spin_lock(&dev->dev_reservation_lock); 276 if (dev->dev_reserved_node_acl && 277 (dev->dev_reserved_node_acl != sess->se_node_acl)) { 278 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", 279 tpg->se_tpg_tfo->get_fabric_name()); 280 pr_err("Original reserver LUN: %u %s\n", 281 cmd->se_lun->unpacked_lun, 282 dev->dev_reserved_node_acl->initiatorname); 283 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u" 284 " from %s \n", cmd->se_lun->unpacked_lun, 285 cmd->se_deve->mapped_lun, 286 sess->se_node_acl->initiatorname); 287 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 288 ret = -EINVAL; 289 goto out_unlock; 290 } 291 292 dev->dev_reserved_node_acl = sess->se_node_acl; 293 dev->dev_flags |= DF_SPC2_RESERVATIONS; 294 if (sess->sess_bin_isid != 0) { 295 dev->dev_res_bin_isid = sess->sess_bin_isid; 296 dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID; 297 } 298 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u" 299 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), 300 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun, 301 sess->se_node_acl->initiatorname); 302 303 out_unlock: 304 spin_unlock(&dev->dev_reservation_lock); 305 out: 306 if (!ret) 307 target_complete_cmd(cmd, GOOD); 308 return ret; 309 } 310 311 312 /* 313 * Begin SPC-3/SPC-4 Persistent Reservations emulation support 314 * 315 * This function is called by those initiator ports who are *NOT* 316 * the active PR reservation holder when a reservation is present. 317 */ 318 static int core_scsi3_pr_seq_non_holder( 319 struct se_cmd *cmd, 320 unsigned char *cdb, 321 u32 pr_reg_type) 322 { 323 struct se_dev_entry *se_deve; 324 struct se_session *se_sess = cmd->se_sess; 325 int other_cdb = 0, ignore_reg; 326 int registered_nexus = 0, ret = 1; /* Conflict by default */ 327 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ 328 int we = 0; /* Write Exclusive */ 329 int legacy = 0; /* Act like a legacy device and return 330 * RESERVATION CONFLICT on some CDBs */ 331 /* 332 * A legacy SPC-2 reservation is being held. 333 */ 334 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) 335 return core_scsi2_reservation_seq_non_holder(cmd, 336 cdb, pr_reg_type); 337 338 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 339 /* 340 * Determine if the registration should be ignored due to 341 * non-matching ISIDs in core_scsi3_pr_reservation_check(). 342 */ 343 ignore_reg = (pr_reg_type & 0x80000000); 344 if (ignore_reg) 345 pr_reg_type &= ~0x80000000; 346 347 switch (pr_reg_type) { 348 case PR_TYPE_WRITE_EXCLUSIVE: 349 we = 1; 350 case PR_TYPE_EXCLUSIVE_ACCESS: 351 /* 352 * Some commands are only allowed for the persistent reservation 353 * holder. 354 */ 355 if ((se_deve->def_pr_registered) && !(ignore_reg)) 356 registered_nexus = 1; 357 break; 358 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 359 we = 1; 360 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 361 /* 362 * Some commands are only allowed for registered I_T Nexuses. 363 */ 364 reg_only = 1; 365 if ((se_deve->def_pr_registered) && !(ignore_reg)) 366 registered_nexus = 1; 367 break; 368 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 369 we = 1; 370 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 371 /* 372 * Each registered I_T Nexus is a reservation holder. 373 */ 374 all_reg = 1; 375 if ((se_deve->def_pr_registered) && !(ignore_reg)) 376 registered_nexus = 1; 377 break; 378 default: 379 return -EINVAL; 380 } 381 /* 382 * Referenced from spc4r17 table 45 for *NON* PR holder access 383 */ 384 switch (cdb[0]) { 385 case SECURITY_PROTOCOL_IN: 386 if (registered_nexus) 387 return 0; 388 ret = (we) ? 0 : 1; 389 break; 390 case MODE_SENSE: 391 case MODE_SENSE_10: 392 case READ_ATTRIBUTE: 393 case READ_BUFFER: 394 case RECEIVE_DIAGNOSTIC: 395 if (legacy) { 396 ret = 1; 397 break; 398 } 399 if (registered_nexus) { 400 ret = 0; 401 break; 402 } 403 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 404 break; 405 case PERSISTENT_RESERVE_OUT: 406 /* 407 * This follows PERSISTENT_RESERVE_OUT service actions that 408 * are allowed in the presence of various reservations. 409 * See spc4r17, table 46 410 */ 411 switch (cdb[1] & 0x1f) { 412 case PRO_CLEAR: 413 case PRO_PREEMPT: 414 case PRO_PREEMPT_AND_ABORT: 415 ret = (registered_nexus) ? 0 : 1; 416 break; 417 case PRO_REGISTER: 418 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 419 ret = 0; 420 break; 421 case PRO_REGISTER_AND_MOVE: 422 case PRO_RESERVE: 423 ret = 1; 424 break; 425 case PRO_RELEASE: 426 ret = (registered_nexus) ? 0 : 1; 427 break; 428 default: 429 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 430 " action: 0x%02x\n", cdb[1] & 0x1f); 431 return -EINVAL; 432 } 433 break; 434 case RELEASE: 435 case RELEASE_10: 436 /* Handled by CRH=1 in target_scsi2_reservation_release() */ 437 ret = 0; 438 break; 439 case RESERVE: 440 case RESERVE_10: 441 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ 442 ret = 0; 443 break; 444 case TEST_UNIT_READY: 445 ret = (legacy) ? 1 : 0; /* Conflict for legacy */ 446 break; 447 case MAINTENANCE_IN: 448 switch (cdb[1] & 0x1f) { 449 case MI_MANAGEMENT_PROTOCOL_IN: 450 if (registered_nexus) { 451 ret = 0; 452 break; 453 } 454 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 455 break; 456 case MI_REPORT_SUPPORTED_OPERATION_CODES: 457 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: 458 if (legacy) { 459 ret = 1; 460 break; 461 } 462 if (registered_nexus) { 463 ret = 0; 464 break; 465 } 466 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ 467 break; 468 case MI_REPORT_ALIASES: 469 case MI_REPORT_IDENTIFYING_INFORMATION: 470 case MI_REPORT_PRIORITY: 471 case MI_REPORT_TARGET_PGS: 472 case MI_REPORT_TIMESTAMP: 473 ret = 0; /* Allowed */ 474 break; 475 default: 476 pr_err("Unknown MI Service Action: 0x%02x\n", 477 (cdb[1] & 0x1f)); 478 return -EINVAL; 479 } 480 break; 481 case ACCESS_CONTROL_IN: 482 case ACCESS_CONTROL_OUT: 483 case INQUIRY: 484 case LOG_SENSE: 485 case READ_MEDIA_SERIAL_NUMBER: 486 case REPORT_LUNS: 487 case REQUEST_SENSE: 488 case PERSISTENT_RESERVE_IN: 489 ret = 0; /*/ Allowed CDBs */ 490 break; 491 default: 492 other_cdb = 1; 493 break; 494 } 495 /* 496 * Case where the CDB is explicitly allowed in the above switch 497 * statement. 498 */ 499 if (!ret && !other_cdb) { 500 pr_debug("Allowing explict CDB: 0x%02x for %s" 501 " reservation holder\n", cdb[0], 502 core_scsi3_pr_dump_type(pr_reg_type)); 503 504 return ret; 505 } 506 /* 507 * Check if write exclusive initiator ports *NOT* holding the 508 * WRITE_EXCLUSIVE_* reservation. 509 */ 510 if (we && !registered_nexus) { 511 if (cmd->data_direction == DMA_TO_DEVICE) { 512 /* 513 * Conflict for write exclusive 514 */ 515 pr_debug("%s Conflict for unregistered nexus" 516 " %s CDB: 0x%02x to %s reservation\n", 517 transport_dump_cmd_direction(cmd), 518 se_sess->se_node_acl->initiatorname, cdb[0], 519 core_scsi3_pr_dump_type(pr_reg_type)); 520 return 1; 521 } else { 522 /* 523 * Allow non WRITE CDBs for all Write Exclusive 524 * PR TYPEs to pass for registered and 525 * non-registered_nexuxes NOT holding the reservation. 526 * 527 * We only make noise for the unregisterd nexuses, 528 * as we expect registered non-reservation holding 529 * nexuses to issue CDBs. 530 */ 531 532 if (!registered_nexus) { 533 pr_debug("Allowing implict CDB: 0x%02x" 534 " for %s reservation on unregistered" 535 " nexus\n", cdb[0], 536 core_scsi3_pr_dump_type(pr_reg_type)); 537 } 538 539 return 0; 540 } 541 } else if ((reg_only) || (all_reg)) { 542 if (registered_nexus) { 543 /* 544 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations, 545 * allow commands from registered nexuses. 546 */ 547 548 pr_debug("Allowing implict CDB: 0x%02x for %s" 549 " reservation\n", cdb[0], 550 core_scsi3_pr_dump_type(pr_reg_type)); 551 552 return 0; 553 } 554 } 555 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x" 556 " for %s reservation\n", transport_dump_cmd_direction(cmd), 557 (registered_nexus) ? "" : "un", 558 se_sess->se_node_acl->initiatorname, cdb[0], 559 core_scsi3_pr_dump_type(pr_reg_type)); 560 561 return 1; /* Conflict by default */ 562 } 563 564 static u32 core_scsi3_pr_generation(struct se_device *dev) 565 { 566 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 567 u32 prg; 568 /* 569 * PRGeneration field shall contain the value of a 32-bit wrapping 570 * counter mainted by the device server. 571 * 572 * Note that this is done regardless of Active Persist across 573 * Target PowerLoss (APTPL) 574 * 575 * See spc4r17 section 6.3.12 READ_KEYS service action 576 */ 577 spin_lock(&dev->dev_reservation_lock); 578 prg = su_dev->t10_pr.pr_generation++; 579 spin_unlock(&dev->dev_reservation_lock); 580 581 return prg; 582 } 583 584 static int core_scsi3_pr_reservation_check( 585 struct se_cmd *cmd, 586 u32 *pr_reg_type) 587 { 588 struct se_device *dev = cmd->se_dev; 589 struct se_session *sess = cmd->se_sess; 590 int ret; 591 592 if (!sess) 593 return 0; 594 /* 595 * A legacy SPC-2 reservation is being held. 596 */ 597 if (dev->dev_flags & DF_SPC2_RESERVATIONS) 598 return core_scsi2_reservation_check(cmd, pr_reg_type); 599 600 spin_lock(&dev->dev_reservation_lock); 601 if (!dev->dev_pr_res_holder) { 602 spin_unlock(&dev->dev_reservation_lock); 603 return 0; 604 } 605 *pr_reg_type = dev->dev_pr_res_holder->pr_res_type; 606 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key; 607 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) { 608 spin_unlock(&dev->dev_reservation_lock); 609 return -EINVAL; 610 } 611 if (!dev->dev_pr_res_holder->isid_present_at_reg) { 612 spin_unlock(&dev->dev_reservation_lock); 613 return 0; 614 } 615 ret = (dev->dev_pr_res_holder->pr_reg_bin_isid == 616 sess->sess_bin_isid) ? 0 : -EINVAL; 617 /* 618 * Use bit in *pr_reg_type to notify ISID mismatch in 619 * core_scsi3_pr_seq_non_holder(). 620 */ 621 if (ret != 0) 622 *pr_reg_type |= 0x80000000; 623 spin_unlock(&dev->dev_reservation_lock); 624 625 return ret; 626 } 627 628 static struct t10_pr_registration *__core_scsi3_do_alloc_registration( 629 struct se_device *dev, 630 struct se_node_acl *nacl, 631 struct se_dev_entry *deve, 632 unsigned char *isid, 633 u64 sa_res_key, 634 int all_tg_pt, 635 int aptpl) 636 { 637 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 638 struct t10_pr_registration *pr_reg; 639 640 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC); 641 if (!pr_reg) { 642 pr_err("Unable to allocate struct t10_pr_registration\n"); 643 return NULL; 644 } 645 646 pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len, 647 GFP_ATOMIC); 648 if (!pr_reg->pr_aptpl_buf) { 649 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n"); 650 kmem_cache_free(t10_pr_reg_cache, pr_reg); 651 return NULL; 652 } 653 654 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 655 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 656 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 657 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 658 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 659 atomic_set(&pr_reg->pr_res_holders, 0); 660 pr_reg->pr_reg_nacl = nacl; 661 pr_reg->pr_reg_deve = deve; 662 pr_reg->pr_res_mapped_lun = deve->mapped_lun; 663 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun; 664 pr_reg->pr_res_key = sa_res_key; 665 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 666 pr_reg->pr_reg_aptpl = aptpl; 667 pr_reg->pr_reg_tg_pt_lun = deve->se_lun; 668 /* 669 * If an ISID value for this SCSI Initiator Port exists, 670 * save it to the registration now. 671 */ 672 if (isid != NULL) { 673 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 674 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 675 pr_reg->isid_present_at_reg = 1; 676 } 677 678 return pr_reg; 679 } 680 681 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *); 682 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *); 683 684 /* 685 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0 686 * modes. 687 */ 688 static struct t10_pr_registration *__core_scsi3_alloc_registration( 689 struct se_device *dev, 690 struct se_node_acl *nacl, 691 struct se_dev_entry *deve, 692 unsigned char *isid, 693 u64 sa_res_key, 694 int all_tg_pt, 695 int aptpl) 696 { 697 struct se_dev_entry *deve_tmp; 698 struct se_node_acl *nacl_tmp; 699 struct se_port *port, *port_tmp; 700 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 701 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe; 702 int ret; 703 /* 704 * Create a registration for the I_T Nexus upon which the 705 * PROUT REGISTER was received. 706 */ 707 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid, 708 sa_res_key, all_tg_pt, aptpl); 709 if (!pr_reg) 710 return NULL; 711 /* 712 * Return pointer to pr_reg for ALL_TG_PT=0 713 */ 714 if (!all_tg_pt) 715 return pr_reg; 716 /* 717 * Create list of matching SCSI Initiator Port registrations 718 * for ALL_TG_PT=1 719 */ 720 spin_lock(&dev->se_port_lock); 721 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) { 722 atomic_inc(&port->sep_tg_pt_ref_cnt); 723 smp_mb__after_atomic_inc(); 724 spin_unlock(&dev->se_port_lock); 725 726 spin_lock_bh(&port->sep_alua_lock); 727 list_for_each_entry(deve_tmp, &port->sep_alua_list, 728 alua_port_list) { 729 /* 730 * This pointer will be NULL for demo mode MappedLUNs 731 * that have not been make explict via a ConfigFS 732 * MappedLUN group for the SCSI Initiator Node ACL. 733 */ 734 if (!deve_tmp->se_lun_acl) 735 continue; 736 737 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl; 738 /* 739 * Skip the matching struct se_node_acl that is allocated 740 * above.. 741 */ 742 if (nacl == nacl_tmp) 743 continue; 744 /* 745 * Only perform PR registrations for target ports on 746 * the same fabric module as the REGISTER w/ ALL_TG_PT=1 747 * arrived. 748 */ 749 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo) 750 continue; 751 /* 752 * Look for a matching Initiator Node ACL in ASCII format 753 */ 754 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname)) 755 continue; 756 757 atomic_inc(&deve_tmp->pr_ref_count); 758 smp_mb__after_atomic_inc(); 759 spin_unlock_bh(&port->sep_alua_lock); 760 /* 761 * Grab a configfs group dependency that is released 762 * for the exception path at label out: below, or upon 763 * completion of adding ALL_TG_PT=1 registrations in 764 * __core_scsi3_add_registration() 765 */ 766 ret = core_scsi3_lunacl_depend_item(deve_tmp); 767 if (ret < 0) { 768 pr_err("core_scsi3_lunacl_depend" 769 "_item() failed\n"); 770 atomic_dec(&port->sep_tg_pt_ref_cnt); 771 smp_mb__after_atomic_dec(); 772 atomic_dec(&deve_tmp->pr_ref_count); 773 smp_mb__after_atomic_dec(); 774 goto out; 775 } 776 /* 777 * Located a matching SCSI Initiator Port on a different 778 * port, allocate the pr_reg_atp and attach it to the 779 * pr_reg->pr_reg_atp_list that will be processed once 780 * the original *pr_reg is processed in 781 * __core_scsi3_add_registration() 782 */ 783 pr_reg_atp = __core_scsi3_do_alloc_registration(dev, 784 nacl_tmp, deve_tmp, NULL, 785 sa_res_key, all_tg_pt, aptpl); 786 if (!pr_reg_atp) { 787 atomic_dec(&port->sep_tg_pt_ref_cnt); 788 smp_mb__after_atomic_dec(); 789 atomic_dec(&deve_tmp->pr_ref_count); 790 smp_mb__after_atomic_dec(); 791 core_scsi3_lunacl_undepend_item(deve_tmp); 792 goto out; 793 } 794 795 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list, 796 &pr_reg->pr_reg_atp_list); 797 spin_lock_bh(&port->sep_alua_lock); 798 } 799 spin_unlock_bh(&port->sep_alua_lock); 800 801 spin_lock(&dev->se_port_lock); 802 atomic_dec(&port->sep_tg_pt_ref_cnt); 803 smp_mb__after_atomic_dec(); 804 } 805 spin_unlock(&dev->se_port_lock); 806 807 return pr_reg; 808 out: 809 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 810 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 811 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 812 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 813 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 814 } 815 kmem_cache_free(t10_pr_reg_cache, pr_reg); 816 return NULL; 817 } 818 819 int core_scsi3_alloc_aptpl_registration( 820 struct t10_reservation *pr_tmpl, 821 u64 sa_res_key, 822 unsigned char *i_port, 823 unsigned char *isid, 824 u32 mapped_lun, 825 unsigned char *t_port, 826 u16 tpgt, 827 u32 target_lun, 828 int res_holder, 829 int all_tg_pt, 830 u8 type) 831 { 832 struct t10_pr_registration *pr_reg; 833 834 if (!i_port || !t_port || !sa_res_key) { 835 pr_err("Illegal parameters for APTPL registration\n"); 836 return -EINVAL; 837 } 838 839 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL); 840 if (!pr_reg) { 841 pr_err("Unable to allocate struct t10_pr_registration\n"); 842 return -ENOMEM; 843 } 844 pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL); 845 846 INIT_LIST_HEAD(&pr_reg->pr_reg_list); 847 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); 848 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); 849 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list); 850 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list); 851 atomic_set(&pr_reg->pr_res_holders, 0); 852 pr_reg->pr_reg_nacl = NULL; 853 pr_reg->pr_reg_deve = NULL; 854 pr_reg->pr_res_mapped_lun = mapped_lun; 855 pr_reg->pr_aptpl_target_lun = target_lun; 856 pr_reg->pr_res_key = sa_res_key; 857 pr_reg->pr_reg_all_tg_pt = all_tg_pt; 858 pr_reg->pr_reg_aptpl = 1; 859 pr_reg->pr_reg_tg_pt_lun = NULL; 860 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */ 861 pr_reg->pr_res_type = type; 862 /* 863 * If an ISID value had been saved in APTPL metadata for this 864 * SCSI Initiator Port, restore it now. 865 */ 866 if (isid != NULL) { 867 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid); 868 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid); 869 pr_reg->isid_present_at_reg = 1; 870 } 871 /* 872 * Copy the i_port and t_port information from caller. 873 */ 874 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port); 875 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port); 876 pr_reg->pr_reg_tpgt = tpgt; 877 /* 878 * Set pr_res_holder from caller, the pr_reg who is the reservation 879 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once 880 * the Initiator Node LUN ACL from the fabric module is created for 881 * this registration. 882 */ 883 pr_reg->pr_res_holder = res_holder; 884 885 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list); 886 pr_debug("SPC-3 PR APTPL Successfully added registration%s from" 887 " metadata\n", (res_holder) ? "+reservation" : ""); 888 return 0; 889 } 890 891 static void core_scsi3_aptpl_reserve( 892 struct se_device *dev, 893 struct se_portal_group *tpg, 894 struct se_node_acl *node_acl, 895 struct t10_pr_registration *pr_reg) 896 { 897 char i_buf[PR_REG_ISID_ID_LEN]; 898 int prf_isid; 899 900 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 901 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 902 PR_REG_ISID_ID_LEN); 903 904 spin_lock(&dev->dev_reservation_lock); 905 dev->dev_pr_res_holder = pr_reg; 906 spin_unlock(&dev->dev_reservation_lock); 907 908 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created" 909 " new reservation holder TYPE: %s ALL_TG_PT: %d\n", 910 tpg->se_tpg_tfo->get_fabric_name(), 911 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 912 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 913 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 914 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname, 915 (prf_isid) ? &i_buf[0] : ""); 916 } 917 918 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *, 919 struct t10_pr_registration *, int, int); 920 921 static int __core_scsi3_check_aptpl_registration( 922 struct se_device *dev, 923 struct se_portal_group *tpg, 924 struct se_lun *lun, 925 u32 target_lun, 926 struct se_node_acl *nacl, 927 struct se_dev_entry *deve) 928 { 929 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 930 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 931 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN]; 932 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN]; 933 u16 tpgt; 934 935 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); 936 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); 937 /* 938 * Copy Initiator Port information from struct se_node_acl 939 */ 940 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname); 941 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s", 942 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 943 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 944 /* 945 * Look for the matching registrations+reservation from those 946 * created from APTPL metadata. Note that multiple registrations 947 * may exist for fabrics that use ISIDs in their SCSI Initiator Port 948 * TransportIDs. 949 */ 950 spin_lock(&pr_tmpl->aptpl_reg_lock); 951 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 952 pr_reg_aptpl_list) { 953 if (!strcmp(pr_reg->pr_iport, i_port) && 954 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) && 955 !(strcmp(pr_reg->pr_tport, t_port)) && 956 (pr_reg->pr_reg_tpgt == tpgt) && 957 (pr_reg->pr_aptpl_target_lun == target_lun)) { 958 959 pr_reg->pr_reg_nacl = nacl; 960 pr_reg->pr_reg_deve = deve; 961 pr_reg->pr_reg_tg_pt_lun = lun; 962 963 list_del(&pr_reg->pr_reg_aptpl_list); 964 spin_unlock(&pr_tmpl->aptpl_reg_lock); 965 /* 966 * At this point all of the pointers in *pr_reg will 967 * be setup, so go ahead and add the registration. 968 */ 969 970 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0); 971 /* 972 * If this registration is the reservation holder, 973 * make that happen now.. 974 */ 975 if (pr_reg->pr_res_holder) 976 core_scsi3_aptpl_reserve(dev, tpg, 977 nacl, pr_reg); 978 /* 979 * Reenable pr_aptpl_active to accept new metadata 980 * updates once the SCSI device is active again.. 981 */ 982 spin_lock(&pr_tmpl->aptpl_reg_lock); 983 pr_tmpl->pr_aptpl_active = 1; 984 } 985 } 986 spin_unlock(&pr_tmpl->aptpl_reg_lock); 987 988 return 0; 989 } 990 991 int core_scsi3_check_aptpl_registration( 992 struct se_device *dev, 993 struct se_portal_group *tpg, 994 struct se_lun *lun, 995 struct se_lun_acl *lun_acl) 996 { 997 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 998 struct se_node_acl *nacl = lun_acl->se_lun_nacl; 999 struct se_dev_entry *deve = nacl->device_list[lun_acl->mapped_lun]; 1000 1001 if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS) 1002 return 0; 1003 1004 return __core_scsi3_check_aptpl_registration(dev, tpg, lun, 1005 lun->unpacked_lun, nacl, deve); 1006 } 1007 1008 static void __core_scsi3_dump_registration( 1009 struct target_core_fabric_ops *tfo, 1010 struct se_device *dev, 1011 struct se_node_acl *nacl, 1012 struct t10_pr_registration *pr_reg, 1013 int register_type) 1014 { 1015 struct se_portal_group *se_tpg = nacl->se_tpg; 1016 char i_buf[PR_REG_ISID_ID_LEN]; 1017 int prf_isid; 1018 1019 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN); 1020 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 1021 PR_REG_ISID_ID_LEN); 1022 1023 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator" 1024 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ? 1025 "_AND_MOVE" : (register_type == 1) ? 1026 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname, 1027 (prf_isid) ? i_buf : ""); 1028 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n", 1029 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg), 1030 tfo->tpg_get_tag(se_tpg)); 1031 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1032 " Port(s)\n", tfo->get_fabric_name(), 1033 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1034 dev->transport->name); 1035 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1036 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(), 1037 pr_reg->pr_res_key, pr_reg->pr_res_generation, 1038 pr_reg->pr_reg_aptpl); 1039 } 1040 1041 /* 1042 * this function can be called with struct se_device->dev_reservation_lock 1043 * when register_move = 1 1044 */ 1045 static void __core_scsi3_add_registration( 1046 struct se_device *dev, 1047 struct se_node_acl *nacl, 1048 struct t10_pr_registration *pr_reg, 1049 int register_type, 1050 int register_move) 1051 { 1052 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1053 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 1054 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1055 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1056 1057 /* 1058 * Increment PRgeneration counter for struct se_device upon a successful 1059 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action 1060 * 1061 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service 1062 * action, the struct se_device->dev_reservation_lock will already be held, 1063 * so we do not call core_scsi3_pr_generation() which grabs the lock 1064 * for the REGISTER. 1065 */ 1066 pr_reg->pr_res_generation = (register_move) ? 1067 su_dev->t10_pr.pr_generation++ : 1068 core_scsi3_pr_generation(dev); 1069 1070 spin_lock(&pr_tmpl->registration_lock); 1071 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list); 1072 pr_reg->pr_reg_deve->def_pr_registered = 1; 1073 1074 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type); 1075 spin_unlock(&pr_tmpl->registration_lock); 1076 /* 1077 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE. 1078 */ 1079 if (!pr_reg->pr_reg_all_tg_pt || register_move) 1080 return; 1081 /* 1082 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1 1083 * allocated in __core_scsi3_alloc_registration() 1084 */ 1085 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1086 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) { 1087 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1088 1089 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev); 1090 1091 spin_lock(&pr_tmpl->registration_lock); 1092 list_add_tail(&pr_reg_tmp->pr_reg_list, 1093 &pr_tmpl->registration_list); 1094 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1; 1095 1096 __core_scsi3_dump_registration(tfo, dev, 1097 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp, 1098 register_type); 1099 spin_unlock(&pr_tmpl->registration_lock); 1100 /* 1101 * Drop configfs group dependency reference from 1102 * __core_scsi3_alloc_registration() 1103 */ 1104 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1105 } 1106 } 1107 1108 static int core_scsi3_alloc_registration( 1109 struct se_device *dev, 1110 struct se_node_acl *nacl, 1111 struct se_dev_entry *deve, 1112 unsigned char *isid, 1113 u64 sa_res_key, 1114 int all_tg_pt, 1115 int aptpl, 1116 int register_type, 1117 int register_move) 1118 { 1119 struct t10_pr_registration *pr_reg; 1120 1121 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid, 1122 sa_res_key, all_tg_pt, aptpl); 1123 if (!pr_reg) 1124 return -EPERM; 1125 1126 __core_scsi3_add_registration(dev, nacl, pr_reg, 1127 register_type, register_move); 1128 return 0; 1129 } 1130 1131 static struct t10_pr_registration *__core_scsi3_locate_pr_reg( 1132 struct se_device *dev, 1133 struct se_node_acl *nacl, 1134 unsigned char *isid) 1135 { 1136 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1137 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 1138 struct se_portal_group *tpg; 1139 1140 spin_lock(&pr_tmpl->registration_lock); 1141 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1142 &pr_tmpl->registration_list, pr_reg_list) { 1143 /* 1144 * First look for a matching struct se_node_acl 1145 */ 1146 if (pr_reg->pr_reg_nacl != nacl) 1147 continue; 1148 1149 tpg = pr_reg->pr_reg_nacl->se_tpg; 1150 /* 1151 * If this registration does NOT contain a fabric provided 1152 * ISID, then we have found a match. 1153 */ 1154 if (!pr_reg->isid_present_at_reg) { 1155 /* 1156 * Determine if this SCSI device server requires that 1157 * SCSI Intiatior TransportID w/ ISIDs is enforced 1158 * for fabric modules (iSCSI) requiring them. 1159 */ 1160 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1161 if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) 1162 continue; 1163 } 1164 atomic_inc(&pr_reg->pr_res_holders); 1165 smp_mb__after_atomic_inc(); 1166 spin_unlock(&pr_tmpl->registration_lock); 1167 return pr_reg; 1168 } 1169 /* 1170 * If the *pr_reg contains a fabric defined ISID for multi-value 1171 * SCSI Initiator Port TransportIDs, then we expect a valid 1172 * matching ISID to be provided by the local SCSI Initiator Port. 1173 */ 1174 if (!isid) 1175 continue; 1176 if (strcmp(isid, pr_reg->pr_reg_isid)) 1177 continue; 1178 1179 atomic_inc(&pr_reg->pr_res_holders); 1180 smp_mb__after_atomic_inc(); 1181 spin_unlock(&pr_tmpl->registration_lock); 1182 return pr_reg; 1183 } 1184 spin_unlock(&pr_tmpl->registration_lock); 1185 1186 return NULL; 1187 } 1188 1189 static struct t10_pr_registration *core_scsi3_locate_pr_reg( 1190 struct se_device *dev, 1191 struct se_node_acl *nacl, 1192 struct se_session *sess) 1193 { 1194 struct se_portal_group *tpg = nacl->se_tpg; 1195 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 1196 1197 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 1198 memset(&buf[0], 0, PR_REG_ISID_LEN); 1199 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0], 1200 PR_REG_ISID_LEN); 1201 isid_ptr = &buf[0]; 1202 } 1203 1204 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr); 1205 } 1206 1207 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg) 1208 { 1209 atomic_dec(&pr_reg->pr_res_holders); 1210 smp_mb__after_atomic_dec(); 1211 } 1212 1213 static int core_scsi3_check_implict_release( 1214 struct se_device *dev, 1215 struct t10_pr_registration *pr_reg) 1216 { 1217 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 1218 struct t10_pr_registration *pr_res_holder; 1219 int ret = 0; 1220 1221 spin_lock(&dev->dev_reservation_lock); 1222 pr_res_holder = dev->dev_pr_res_holder; 1223 if (!pr_res_holder) { 1224 spin_unlock(&dev->dev_reservation_lock); 1225 return ret; 1226 } 1227 if (pr_res_holder == pr_reg) { 1228 /* 1229 * Perform an implict RELEASE if the registration that 1230 * is being released is holding the reservation. 1231 * 1232 * From spc4r17, section 5.7.11.1: 1233 * 1234 * e) If the I_T nexus is the persistent reservation holder 1235 * and the persistent reservation is not an all registrants 1236 * type, then a PERSISTENT RESERVE OUT command with REGISTER 1237 * service action or REGISTER AND IGNORE EXISTING KEY 1238 * service action with the SERVICE ACTION RESERVATION KEY 1239 * field set to zero (see 5.7.11.3). 1240 */ 1241 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0); 1242 ret = 1; 1243 /* 1244 * For 'All Registrants' reservation types, all existing 1245 * registrations are still processed as reservation holders 1246 * in core_scsi3_pr_seq_non_holder() after the initial 1247 * reservation holder is implictly released here. 1248 */ 1249 } else if (pr_reg->pr_reg_all_tg_pt && 1250 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname, 1251 pr_reg->pr_reg_nacl->initiatorname)) && 1252 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) { 1253 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1" 1254 " UNREGISTER while existing reservation with matching" 1255 " key 0x%016Lx is present from another SCSI Initiator" 1256 " Port\n", pr_reg->pr_res_key); 1257 ret = -EPERM; 1258 } 1259 spin_unlock(&dev->dev_reservation_lock); 1260 1261 return ret; 1262 } 1263 1264 /* 1265 * Called with struct t10_reservation->registration_lock held. 1266 */ 1267 static void __core_scsi3_free_registration( 1268 struct se_device *dev, 1269 struct t10_pr_registration *pr_reg, 1270 struct list_head *preempt_and_abort_list, 1271 int dec_holders) 1272 { 1273 struct target_core_fabric_ops *tfo = 1274 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo; 1275 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1276 char i_buf[PR_REG_ISID_ID_LEN]; 1277 int prf_isid; 1278 1279 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1280 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 1281 PR_REG_ISID_ID_LEN); 1282 1283 pr_reg->pr_reg_deve->def_pr_registered = 0; 1284 pr_reg->pr_reg_deve->pr_res_key = 0; 1285 list_del(&pr_reg->pr_reg_list); 1286 /* 1287 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(), 1288 * so call core_scsi3_put_pr_reg() to decrement our reference. 1289 */ 1290 if (dec_holders) 1291 core_scsi3_put_pr_reg(pr_reg); 1292 /* 1293 * Wait until all reference from any other I_T nexuses for this 1294 * *pr_reg have been released. Because list_del() is called above, 1295 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference 1296 * count back to zero, and we release *pr_reg. 1297 */ 1298 while (atomic_read(&pr_reg->pr_res_holders) != 0) { 1299 spin_unlock(&pr_tmpl->registration_lock); 1300 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n", 1301 tfo->get_fabric_name()); 1302 cpu_relax(); 1303 spin_lock(&pr_tmpl->registration_lock); 1304 } 1305 1306 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator" 1307 " Node: %s%s\n", tfo->get_fabric_name(), 1308 pr_reg->pr_reg_nacl->initiatorname, 1309 (prf_isid) ? &i_buf[0] : ""); 1310 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target" 1311 " Port(s)\n", tfo->get_fabric_name(), 1312 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE", 1313 dev->transport->name); 1314 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:" 1315 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key, 1316 pr_reg->pr_res_generation); 1317 1318 if (!preempt_and_abort_list) { 1319 pr_reg->pr_reg_deve = NULL; 1320 pr_reg->pr_reg_nacl = NULL; 1321 kfree(pr_reg->pr_aptpl_buf); 1322 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1323 return; 1324 } 1325 /* 1326 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list 1327 * are released once the ABORT_TASK_SET has completed.. 1328 */ 1329 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list); 1330 } 1331 1332 void core_scsi3_free_pr_reg_from_nacl( 1333 struct se_device *dev, 1334 struct se_node_acl *nacl) 1335 { 1336 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1337 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1338 /* 1339 * If the passed se_node_acl matches the reservation holder, 1340 * release the reservation. 1341 */ 1342 spin_lock(&dev->dev_reservation_lock); 1343 pr_res_holder = dev->dev_pr_res_holder; 1344 if ((pr_res_holder != NULL) && 1345 (pr_res_holder->pr_reg_nacl == nacl)) 1346 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0); 1347 spin_unlock(&dev->dev_reservation_lock); 1348 /* 1349 * Release any registration associated with the struct se_node_acl. 1350 */ 1351 spin_lock(&pr_tmpl->registration_lock); 1352 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1353 &pr_tmpl->registration_list, pr_reg_list) { 1354 1355 if (pr_reg->pr_reg_nacl != nacl) 1356 continue; 1357 1358 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1359 } 1360 spin_unlock(&pr_tmpl->registration_lock); 1361 } 1362 1363 void core_scsi3_free_all_registrations( 1364 struct se_device *dev) 1365 { 1366 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 1367 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder; 1368 1369 spin_lock(&dev->dev_reservation_lock); 1370 pr_res_holder = dev->dev_pr_res_holder; 1371 if (pr_res_holder != NULL) { 1372 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 1373 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 1374 pr_res_holder, 0); 1375 } 1376 spin_unlock(&dev->dev_reservation_lock); 1377 1378 spin_lock(&pr_tmpl->registration_lock); 1379 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 1380 &pr_tmpl->registration_list, pr_reg_list) { 1381 1382 __core_scsi3_free_registration(dev, pr_reg, NULL, 0); 1383 } 1384 spin_unlock(&pr_tmpl->registration_lock); 1385 1386 spin_lock(&pr_tmpl->aptpl_reg_lock); 1387 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, 1388 pr_reg_aptpl_list) { 1389 list_del(&pr_reg->pr_reg_aptpl_list); 1390 kfree(pr_reg->pr_aptpl_buf); 1391 kmem_cache_free(t10_pr_reg_cache, pr_reg); 1392 } 1393 spin_unlock(&pr_tmpl->aptpl_reg_lock); 1394 } 1395 1396 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg) 1397 { 1398 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1399 &tpg->tpg_group.cg_item); 1400 } 1401 1402 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg) 1403 { 1404 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1405 &tpg->tpg_group.cg_item); 1406 1407 atomic_dec(&tpg->tpg_pr_ref_count); 1408 smp_mb__after_atomic_dec(); 1409 } 1410 1411 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl) 1412 { 1413 struct se_portal_group *tpg = nacl->se_tpg; 1414 1415 if (nacl->dynamic_node_acl) 1416 return 0; 1417 1418 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1419 &nacl->acl_group.cg_item); 1420 } 1421 1422 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl) 1423 { 1424 struct se_portal_group *tpg = nacl->se_tpg; 1425 1426 if (nacl->dynamic_node_acl) { 1427 atomic_dec(&nacl->acl_pr_ref_count); 1428 smp_mb__after_atomic_dec(); 1429 return; 1430 } 1431 1432 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1433 &nacl->acl_group.cg_item); 1434 1435 atomic_dec(&nacl->acl_pr_ref_count); 1436 smp_mb__after_atomic_dec(); 1437 } 1438 1439 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve) 1440 { 1441 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1442 struct se_node_acl *nacl; 1443 struct se_portal_group *tpg; 1444 /* 1445 * For nacl->dynamic_node_acl=1 1446 */ 1447 if (!lun_acl) 1448 return 0; 1449 1450 nacl = lun_acl->se_lun_nacl; 1451 tpg = nacl->se_tpg; 1452 1453 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys, 1454 &lun_acl->se_lun_group.cg_item); 1455 } 1456 1457 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve) 1458 { 1459 struct se_lun_acl *lun_acl = se_deve->se_lun_acl; 1460 struct se_node_acl *nacl; 1461 struct se_portal_group *tpg; 1462 /* 1463 * For nacl->dynamic_node_acl=1 1464 */ 1465 if (!lun_acl) { 1466 atomic_dec(&se_deve->pr_ref_count); 1467 smp_mb__after_atomic_dec(); 1468 return; 1469 } 1470 nacl = lun_acl->se_lun_nacl; 1471 tpg = nacl->se_tpg; 1472 1473 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys, 1474 &lun_acl->se_lun_group.cg_item); 1475 1476 atomic_dec(&se_deve->pr_ref_count); 1477 smp_mb__after_atomic_dec(); 1478 } 1479 1480 static int core_scsi3_decode_spec_i_port( 1481 struct se_cmd *cmd, 1482 struct se_portal_group *tpg, 1483 unsigned char *l_isid, 1484 u64 sa_res_key, 1485 int all_tg_pt, 1486 int aptpl) 1487 { 1488 struct se_device *dev = cmd->se_dev; 1489 struct se_port *tmp_port; 1490 struct se_portal_group *dest_tpg = NULL, *tmp_tpg; 1491 struct se_session *se_sess = cmd->se_sess; 1492 struct se_node_acl *dest_node_acl = NULL; 1493 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve; 1494 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e; 1495 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe; 1496 LIST_HEAD(tid_dest_list); 1497 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp; 1498 struct target_core_fabric_ops *tmp_tf_ops; 1499 unsigned char *buf; 1500 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident; 1501 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 1502 u32 tpdl, tid_len = 0; 1503 int ret, dest_local_nexus, prf_isid; 1504 u32 dest_rtpi = 0; 1505 1506 memset(dest_iport, 0, 64); 1507 1508 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 1509 /* 1510 * Allocate a struct pr_transport_id_holder and setup the 1511 * local_node_acl and local_se_deve pointers and add to 1512 * struct list_head tid_dest_list for add registration 1513 * processing in the loop of tid_dest_list below. 1514 */ 1515 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL); 1516 if (!tidh_new) { 1517 pr_err("Unable to allocate tidh_new\n"); 1518 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1519 return -EINVAL; 1520 } 1521 INIT_LIST_HEAD(&tidh_new->dest_list); 1522 tidh_new->dest_tpg = tpg; 1523 tidh_new->dest_node_acl = se_sess->se_node_acl; 1524 tidh_new->dest_se_deve = local_se_deve; 1525 1526 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1527 se_sess->se_node_acl, local_se_deve, l_isid, 1528 sa_res_key, all_tg_pt, aptpl); 1529 if (!local_pr_reg) { 1530 kfree(tidh_new); 1531 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1532 return -ENOMEM; 1533 } 1534 tidh_new->dest_pr_reg = local_pr_reg; 1535 /* 1536 * The local I_T nexus does not hold any configfs dependances, 1537 * so we set tid_h->dest_local_nexus=1 to prevent the 1538 * configfs_undepend_item() calls in the tid_dest_list loops below. 1539 */ 1540 tidh_new->dest_local_nexus = 1; 1541 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1542 1543 if (cmd->data_length < 28) { 1544 pr_warn("SPC-PR: Received PR OUT parameter list" 1545 " length too small: %u\n", cmd->data_length); 1546 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1547 ret = -EINVAL; 1548 goto out; 1549 } 1550 1551 buf = transport_kmap_data_sg(cmd); 1552 /* 1553 * For a PERSISTENT RESERVE OUT specify initiator ports payload, 1554 * first extract TransportID Parameter Data Length, and make sure 1555 * the value matches up to the SCSI expected data transfer length. 1556 */ 1557 tpdl = (buf[24] & 0xff) << 24; 1558 tpdl |= (buf[25] & 0xff) << 16; 1559 tpdl |= (buf[26] & 0xff) << 8; 1560 tpdl |= buf[27] & 0xff; 1561 1562 if ((tpdl + 28) != cmd->data_length) { 1563 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header" 1564 " does not equal CDB data_length: %u\n", tpdl, 1565 cmd->data_length); 1566 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1567 ret = -EINVAL; 1568 goto out; 1569 } 1570 /* 1571 * Start processing the received transport IDs using the 1572 * receiving I_T Nexus portal's fabric dependent methods to 1573 * obtain the SCSI Initiator Port/Device Identifiers. 1574 */ 1575 ptr = &buf[28]; 1576 1577 while (tpdl > 0) { 1578 proto_ident = (ptr[0] & 0x0f); 1579 dest_tpg = NULL; 1580 1581 spin_lock(&dev->se_port_lock); 1582 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) { 1583 tmp_tpg = tmp_port->sep_tpg; 1584 if (!tmp_tpg) 1585 continue; 1586 tmp_tf_ops = tmp_tpg->se_tpg_tfo; 1587 if (!tmp_tf_ops) 1588 continue; 1589 if (!tmp_tf_ops->get_fabric_proto_ident || 1590 !tmp_tf_ops->tpg_parse_pr_out_transport_id) 1591 continue; 1592 /* 1593 * Look for the matching proto_ident provided by 1594 * the received TransportID 1595 */ 1596 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg); 1597 if (tmp_proto_ident != proto_ident) 1598 continue; 1599 dest_rtpi = tmp_port->sep_rtpi; 1600 1601 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id( 1602 tmp_tpg, (const char *)ptr, &tid_len, 1603 &iport_ptr); 1604 if (!i_str) 1605 continue; 1606 1607 atomic_inc(&tmp_tpg->tpg_pr_ref_count); 1608 smp_mb__after_atomic_inc(); 1609 spin_unlock(&dev->se_port_lock); 1610 1611 ret = core_scsi3_tpg_depend_item(tmp_tpg); 1612 if (ret != 0) { 1613 pr_err(" core_scsi3_tpg_depend_item()" 1614 " for tmp_tpg\n"); 1615 atomic_dec(&tmp_tpg->tpg_pr_ref_count); 1616 smp_mb__after_atomic_dec(); 1617 cmd->scsi_sense_reason = 1618 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1619 ret = -EINVAL; 1620 goto out; 1621 } 1622 /* 1623 * Locate the desination initiator ACL to be registered 1624 * from the decoded fabric module specific TransportID 1625 * at *i_str. 1626 */ 1627 spin_lock_irq(&tmp_tpg->acl_node_lock); 1628 dest_node_acl = __core_tpg_get_initiator_node_acl( 1629 tmp_tpg, i_str); 1630 if (dest_node_acl) { 1631 atomic_inc(&dest_node_acl->acl_pr_ref_count); 1632 smp_mb__after_atomic_inc(); 1633 } 1634 spin_unlock_irq(&tmp_tpg->acl_node_lock); 1635 1636 if (!dest_node_acl) { 1637 core_scsi3_tpg_undepend_item(tmp_tpg); 1638 spin_lock(&dev->se_port_lock); 1639 continue; 1640 } 1641 1642 ret = core_scsi3_nodeacl_depend_item(dest_node_acl); 1643 if (ret != 0) { 1644 pr_err("configfs_depend_item() failed" 1645 " for dest_node_acl->acl_group\n"); 1646 atomic_dec(&dest_node_acl->acl_pr_ref_count); 1647 smp_mb__after_atomic_dec(); 1648 core_scsi3_tpg_undepend_item(tmp_tpg); 1649 cmd->scsi_sense_reason = 1650 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1651 ret = -EINVAL; 1652 goto out; 1653 } 1654 1655 dest_tpg = tmp_tpg; 1656 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:" 1657 " %s Port RTPI: %hu\n", 1658 dest_tpg->se_tpg_tfo->get_fabric_name(), 1659 dest_node_acl->initiatorname, dest_rtpi); 1660 1661 spin_lock(&dev->se_port_lock); 1662 break; 1663 } 1664 spin_unlock(&dev->se_port_lock); 1665 1666 if (!dest_tpg) { 1667 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate" 1668 " dest_tpg\n"); 1669 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1670 ret = -EINVAL; 1671 goto out; 1672 } 1673 1674 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u" 1675 " tid_len: %d for %s + %s\n", 1676 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length, 1677 tpdl, tid_len, i_str, iport_ptr); 1678 1679 if (tid_len > tpdl) { 1680 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:" 1681 " %u for Transport ID: %s\n", tid_len, ptr); 1682 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1683 core_scsi3_tpg_undepend_item(dest_tpg); 1684 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1685 ret = -EINVAL; 1686 goto out; 1687 } 1688 /* 1689 * Locate the desintation struct se_dev_entry pointer for matching 1690 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus 1691 * Target Port. 1692 */ 1693 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, 1694 dest_rtpi); 1695 if (!dest_se_deve) { 1696 pr_err("Unable to locate %s dest_se_deve" 1697 " from destination RTPI: %hu\n", 1698 dest_tpg->se_tpg_tfo->get_fabric_name(), 1699 dest_rtpi); 1700 1701 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1702 core_scsi3_tpg_undepend_item(dest_tpg); 1703 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1704 ret = -EINVAL; 1705 goto out; 1706 } 1707 1708 ret = core_scsi3_lunacl_depend_item(dest_se_deve); 1709 if (ret < 0) { 1710 pr_err("core_scsi3_lunacl_depend_item()" 1711 " failed\n"); 1712 atomic_dec(&dest_se_deve->pr_ref_count); 1713 smp_mb__after_atomic_dec(); 1714 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1715 core_scsi3_tpg_undepend_item(dest_tpg); 1716 cmd->scsi_sense_reason = 1717 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1718 ret = -EINVAL; 1719 goto out; 1720 } 1721 1722 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s" 1723 " dest_se_deve mapped_lun: %u\n", 1724 dest_tpg->se_tpg_tfo->get_fabric_name(), 1725 dest_node_acl->initiatorname, dest_se_deve->mapped_lun); 1726 1727 /* 1728 * Skip any TransportIDs that already have a registration for 1729 * this target port. 1730 */ 1731 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 1732 iport_ptr); 1733 if (pr_reg_e) { 1734 core_scsi3_put_pr_reg(pr_reg_e); 1735 core_scsi3_lunacl_undepend_item(dest_se_deve); 1736 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1737 core_scsi3_tpg_undepend_item(dest_tpg); 1738 ptr += tid_len; 1739 tpdl -= tid_len; 1740 tid_len = 0; 1741 continue; 1742 } 1743 /* 1744 * Allocate a struct pr_transport_id_holder and setup 1745 * the dest_node_acl and dest_se_deve pointers for the 1746 * loop below. 1747 */ 1748 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), 1749 GFP_KERNEL); 1750 if (!tidh_new) { 1751 pr_err("Unable to allocate tidh_new\n"); 1752 core_scsi3_lunacl_undepend_item(dest_se_deve); 1753 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1754 core_scsi3_tpg_undepend_item(dest_tpg); 1755 cmd->scsi_sense_reason = 1756 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1757 ret = -ENOMEM; 1758 goto out; 1759 } 1760 INIT_LIST_HEAD(&tidh_new->dest_list); 1761 tidh_new->dest_tpg = dest_tpg; 1762 tidh_new->dest_node_acl = dest_node_acl; 1763 tidh_new->dest_se_deve = dest_se_deve; 1764 1765 /* 1766 * Allocate, but do NOT add the registration for the 1767 * TransportID referenced SCSI Initiator port. This 1768 * done because of the following from spc4r17 in section 1769 * 6.14.3 wrt SPEC_I_PT: 1770 * 1771 * "If a registration fails for any initiator port (e.g., if th 1772 * logical unit does not have enough resources available to 1773 * hold the registration information), no registrations shall be 1774 * made, and the command shall be terminated with 1775 * CHECK CONDITION status." 1776 * 1777 * That means we call __core_scsi3_alloc_registration() here, 1778 * and then call __core_scsi3_add_registration() in the 1779 * 2nd loop which will never fail. 1780 */ 1781 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev, 1782 dest_node_acl, dest_se_deve, iport_ptr, 1783 sa_res_key, all_tg_pt, aptpl); 1784 if (!dest_pr_reg) { 1785 core_scsi3_lunacl_undepend_item(dest_se_deve); 1786 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1787 core_scsi3_tpg_undepend_item(dest_tpg); 1788 kfree(tidh_new); 1789 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 1790 ret = -EINVAL; 1791 goto out; 1792 } 1793 tidh_new->dest_pr_reg = dest_pr_reg; 1794 list_add_tail(&tidh_new->dest_list, &tid_dest_list); 1795 1796 ptr += tid_len; 1797 tpdl -= tid_len; 1798 tid_len = 0; 1799 1800 } 1801 1802 transport_kunmap_data_sg(cmd); 1803 1804 /* 1805 * Go ahead and create a registrations from tid_dest_list for the 1806 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl 1807 * and dest_se_deve. 1808 * 1809 * The SA Reservation Key from the PROUT is set for the 1810 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1 1811 * means that the TransportID Initiator port will be 1812 * registered on all of the target ports in the SCSI target device 1813 * ALL_TG_PT=0 means the registration will only be for the 1814 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1 1815 * was received. 1816 */ 1817 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1818 dest_tpg = tidh->dest_tpg; 1819 dest_node_acl = tidh->dest_node_acl; 1820 dest_se_deve = tidh->dest_se_deve; 1821 dest_pr_reg = tidh->dest_pr_reg; 1822 dest_local_nexus = tidh->dest_local_nexus; 1823 1824 list_del(&tidh->dest_list); 1825 kfree(tidh); 1826 1827 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 1828 prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0], 1829 PR_REG_ISID_ID_LEN); 1830 1831 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl, 1832 dest_pr_reg, 0, 0); 1833 1834 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully" 1835 " registered Transport ID for Node: %s%s Mapped LUN:" 1836 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(), 1837 dest_node_acl->initiatorname, (prf_isid) ? 1838 &i_buf[0] : "", dest_se_deve->mapped_lun); 1839 1840 if (dest_local_nexus) 1841 continue; 1842 1843 core_scsi3_lunacl_undepend_item(dest_se_deve); 1844 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1845 core_scsi3_tpg_undepend_item(dest_tpg); 1846 } 1847 1848 return 0; 1849 out: 1850 transport_kunmap_data_sg(cmd); 1851 /* 1852 * For the failure case, release everything from tid_dest_list 1853 * including *dest_pr_reg and the configfs dependances.. 1854 */ 1855 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) { 1856 dest_tpg = tidh->dest_tpg; 1857 dest_node_acl = tidh->dest_node_acl; 1858 dest_se_deve = tidh->dest_se_deve; 1859 dest_pr_reg = tidh->dest_pr_reg; 1860 dest_local_nexus = tidh->dest_local_nexus; 1861 1862 list_del(&tidh->dest_list); 1863 kfree(tidh); 1864 /* 1865 * Release any extra ALL_TG_PT=1 registrations for 1866 * the SPEC_I_PT=1 case. 1867 */ 1868 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe, 1869 &dest_pr_reg->pr_reg_atp_list, 1870 pr_reg_atp_mem_list) { 1871 list_del(&pr_reg_tmp->pr_reg_atp_mem_list); 1872 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve); 1873 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); 1874 } 1875 1876 kfree(dest_pr_reg->pr_aptpl_buf); 1877 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); 1878 1879 if (dest_local_nexus) 1880 continue; 1881 1882 core_scsi3_lunacl_undepend_item(dest_se_deve); 1883 core_scsi3_nodeacl_undepend_item(dest_node_acl); 1884 core_scsi3_tpg_undepend_item(dest_tpg); 1885 } 1886 return ret; 1887 } 1888 1889 /* 1890 * Called with struct se_device->dev_reservation_lock held 1891 */ 1892 static int __core_scsi3_update_aptpl_buf( 1893 struct se_device *dev, 1894 unsigned char *buf, 1895 u32 pr_aptpl_buf_len, 1896 int clear_aptpl_metadata) 1897 { 1898 struct se_lun *lun; 1899 struct se_portal_group *tpg; 1900 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 1901 struct t10_pr_registration *pr_reg; 1902 unsigned char tmp[512], isid_buf[32]; 1903 ssize_t len = 0; 1904 int reg_count = 0; 1905 1906 memset(buf, 0, pr_aptpl_buf_len); 1907 /* 1908 * Called to clear metadata once APTPL has been deactivated. 1909 */ 1910 if (clear_aptpl_metadata) { 1911 snprintf(buf, pr_aptpl_buf_len, 1912 "No Registrations or Reservations\n"); 1913 return 0; 1914 } 1915 /* 1916 * Walk the registration list.. 1917 */ 1918 spin_lock(&su_dev->t10_pr.registration_lock); 1919 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list, 1920 pr_reg_list) { 1921 1922 tmp[0] = '\0'; 1923 isid_buf[0] = '\0'; 1924 tpg = pr_reg->pr_reg_nacl->se_tpg; 1925 lun = pr_reg->pr_reg_tg_pt_lun; 1926 /* 1927 * Write out any ISID value to APTPL metadata that was included 1928 * in the original registration. 1929 */ 1930 if (pr_reg->isid_present_at_reg) 1931 snprintf(isid_buf, 32, "initiator_sid=%s\n", 1932 pr_reg->pr_reg_isid); 1933 /* 1934 * Include special metadata if the pr_reg matches the 1935 * reservation holder. 1936 */ 1937 if (dev->dev_pr_res_holder == pr_reg) { 1938 snprintf(tmp, 512, "PR_REG_START: %d" 1939 "\ninitiator_fabric=%s\n" 1940 "initiator_node=%s\n%s" 1941 "sa_res_key=%llu\n" 1942 "res_holder=1\nres_type=%02x\n" 1943 "res_scope=%02x\nres_all_tg_pt=%d\n" 1944 "mapped_lun=%u\n", reg_count, 1945 tpg->se_tpg_tfo->get_fabric_name(), 1946 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1947 pr_reg->pr_res_key, pr_reg->pr_res_type, 1948 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt, 1949 pr_reg->pr_res_mapped_lun); 1950 } else { 1951 snprintf(tmp, 512, "PR_REG_START: %d\n" 1952 "initiator_fabric=%s\ninitiator_node=%s\n%s" 1953 "sa_res_key=%llu\nres_holder=0\n" 1954 "res_all_tg_pt=%d\nmapped_lun=%u\n", 1955 reg_count, tpg->se_tpg_tfo->get_fabric_name(), 1956 pr_reg->pr_reg_nacl->initiatorname, isid_buf, 1957 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt, 1958 pr_reg->pr_res_mapped_lun); 1959 } 1960 1961 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1962 pr_err("Unable to update renaming" 1963 " APTPL metadata\n"); 1964 spin_unlock(&su_dev->t10_pr.registration_lock); 1965 return -EMSGSIZE; 1966 } 1967 len += sprintf(buf+len, "%s", tmp); 1968 1969 /* 1970 * Include information about the associated SCSI target port. 1971 */ 1972 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n" 1973 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:" 1974 " %d\n", tpg->se_tpg_tfo->get_fabric_name(), 1975 tpg->se_tpg_tfo->tpg_get_wwn(tpg), 1976 tpg->se_tpg_tfo->tpg_get_tag(tpg), 1977 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count); 1978 1979 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) { 1980 pr_err("Unable to update renaming" 1981 " APTPL metadata\n"); 1982 spin_unlock(&su_dev->t10_pr.registration_lock); 1983 return -EMSGSIZE; 1984 } 1985 len += sprintf(buf+len, "%s", tmp); 1986 reg_count++; 1987 } 1988 spin_unlock(&su_dev->t10_pr.registration_lock); 1989 1990 if (!reg_count) 1991 len += sprintf(buf+len, "No Registrations or Reservations"); 1992 1993 return 0; 1994 } 1995 1996 static int core_scsi3_update_aptpl_buf( 1997 struct se_device *dev, 1998 unsigned char *buf, 1999 u32 pr_aptpl_buf_len, 2000 int clear_aptpl_metadata) 2001 { 2002 int ret; 2003 2004 spin_lock(&dev->dev_reservation_lock); 2005 ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, 2006 clear_aptpl_metadata); 2007 spin_unlock(&dev->dev_reservation_lock); 2008 2009 return ret; 2010 } 2011 2012 /* 2013 * Called with struct se_device->aptpl_file_mutex held 2014 */ 2015 static int __core_scsi3_write_aptpl_to_file( 2016 struct se_device *dev, 2017 unsigned char *buf, 2018 u32 pr_aptpl_buf_len) 2019 { 2020 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; 2021 struct file *file; 2022 struct iovec iov[1]; 2023 mm_segment_t old_fs; 2024 int flags = O_RDWR | O_CREAT | O_TRUNC; 2025 char path[512]; 2026 int ret; 2027 2028 memset(iov, 0, sizeof(struct iovec)); 2029 memset(path, 0, 512); 2030 2031 if (strlen(&wwn->unit_serial[0]) >= 512) { 2032 pr_err("WWN value for struct se_device does not fit" 2033 " into path buffer\n"); 2034 return -EMSGSIZE; 2035 } 2036 2037 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]); 2038 file = filp_open(path, flags, 0600); 2039 if (IS_ERR(file) || !file || !file->f_dentry) { 2040 pr_err("filp_open(%s) for APTPL metadata" 2041 " failed\n", path); 2042 return IS_ERR(file) ? PTR_ERR(file) : -ENOENT; 2043 } 2044 2045 iov[0].iov_base = &buf[0]; 2046 if (!pr_aptpl_buf_len) 2047 iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */ 2048 else 2049 iov[0].iov_len = pr_aptpl_buf_len; 2050 2051 old_fs = get_fs(); 2052 set_fs(get_ds()); 2053 ret = vfs_writev(file, &iov[0], 1, &file->f_pos); 2054 set_fs(old_fs); 2055 2056 if (ret < 0) { 2057 pr_debug("Error writing APTPL metadata file: %s\n", path); 2058 filp_close(file, NULL); 2059 return -EIO; 2060 } 2061 filp_close(file, NULL); 2062 2063 return 0; 2064 } 2065 2066 static int core_scsi3_update_and_write_aptpl( 2067 struct se_device *dev, 2068 unsigned char *in_buf, 2069 u32 in_pr_aptpl_buf_len) 2070 { 2071 unsigned char null_buf[64], *buf; 2072 u32 pr_aptpl_buf_len; 2073 int ret, clear_aptpl_metadata = 0; 2074 /* 2075 * Can be called with a NULL pointer from PROUT service action CLEAR 2076 */ 2077 if (!in_buf) { 2078 memset(null_buf, 0, 64); 2079 buf = &null_buf[0]; 2080 /* 2081 * This will clear the APTPL metadata to: 2082 * "No Registrations or Reservations" status 2083 */ 2084 pr_aptpl_buf_len = 64; 2085 clear_aptpl_metadata = 1; 2086 } else { 2087 buf = in_buf; 2088 pr_aptpl_buf_len = in_pr_aptpl_buf_len; 2089 } 2090 2091 ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len, 2092 clear_aptpl_metadata); 2093 if (ret != 0) 2094 return ret; 2095 /* 2096 * __core_scsi3_write_aptpl_to_file() will call strlen() 2097 * on the passed buf to determine pr_aptpl_buf_len. 2098 */ 2099 ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0); 2100 if (ret != 0) 2101 return ret; 2102 2103 return ret; 2104 } 2105 2106 static int core_scsi3_emulate_pro_register( 2107 struct se_cmd *cmd, 2108 u64 res_key, 2109 u64 sa_res_key, 2110 int aptpl, 2111 int all_tg_pt, 2112 int spec_i_pt, 2113 int ignore_key) 2114 { 2115 struct se_session *se_sess = cmd->se_sess; 2116 struct se_device *dev = cmd->se_dev; 2117 struct se_dev_entry *se_deve; 2118 struct se_lun *se_lun = cmd->se_lun; 2119 struct se_portal_group *se_tpg; 2120 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e; 2121 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2122 /* Used for APTPL metadata w/ UNREGISTER */ 2123 unsigned char *pr_aptpl_buf = NULL; 2124 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; 2125 int pr_holder = 0, ret = 0, type; 2126 2127 if (!se_sess || !se_lun) { 2128 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2129 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2130 return -EINVAL; 2131 } 2132 se_tpg = se_sess->se_tpg; 2133 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun]; 2134 2135 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) { 2136 memset(&isid_buf[0], 0, PR_REG_ISID_LEN); 2137 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0], 2138 PR_REG_ISID_LEN); 2139 isid_ptr = &isid_buf[0]; 2140 } 2141 /* 2142 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47 2143 */ 2144 pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2145 if (!pr_reg_e) { 2146 if (res_key) { 2147 pr_warn("SPC-3 PR: Reservation Key non-zero" 2148 " for SA REGISTER, returning CONFLICT\n"); 2149 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2150 return -EINVAL; 2151 } 2152 /* 2153 * Do nothing but return GOOD status. 2154 */ 2155 if (!sa_res_key) 2156 return 0; 2157 2158 if (!spec_i_pt) { 2159 /* 2160 * Perform the Service Action REGISTER on the Initiator 2161 * Port Endpoint that the PRO was received from on the 2162 * Logical Unit of the SCSI device server. 2163 */ 2164 ret = core_scsi3_alloc_registration(cmd->se_dev, 2165 se_sess->se_node_acl, se_deve, isid_ptr, 2166 sa_res_key, all_tg_pt, aptpl, 2167 ignore_key, 0); 2168 if (ret != 0) { 2169 pr_err("Unable to allocate" 2170 " struct t10_pr_registration\n"); 2171 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2172 return -EINVAL; 2173 } 2174 } else { 2175 /* 2176 * Register both the Initiator port that received 2177 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI 2178 * TransportID from Parameter list and loop through 2179 * fabric dependent parameter list while calling 2180 * logic from of core_scsi3_alloc_registration() for 2181 * each TransportID provided SCSI Initiator Port/Device 2182 */ 2183 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg, 2184 isid_ptr, sa_res_key, all_tg_pt, aptpl); 2185 if (ret != 0) 2186 return ret; 2187 } 2188 /* 2189 * Nothing left to do for the APTPL=0 case. 2190 */ 2191 if (!aptpl) { 2192 pr_tmpl->pr_aptpl_active = 0; 2193 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 2194 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" 2195 " REGISTER\n"); 2196 return 0; 2197 } 2198 /* 2199 * Locate the newly allocated local I_T Nexus *pr_reg, and 2200 * update the APTPL metadata information using its 2201 * preallocated *pr_reg->pr_aptpl_buf. 2202 */ 2203 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, 2204 se_sess->se_node_acl, se_sess); 2205 2206 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2207 &pr_reg->pr_aptpl_buf[0], 2208 pr_tmpl->pr_aptpl_buf_len); 2209 if (!ret) { 2210 pr_tmpl->pr_aptpl_active = 1; 2211 pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n"); 2212 } 2213 2214 core_scsi3_put_pr_reg(pr_reg); 2215 return ret; 2216 } else { 2217 /* 2218 * Locate the existing *pr_reg via struct se_node_acl pointers 2219 */ 2220 pr_reg = pr_reg_e; 2221 type = pr_reg->pr_res_type; 2222 2223 if (!ignore_key) { 2224 if (res_key != pr_reg->pr_res_key) { 2225 pr_err("SPC-3 PR REGISTER: Received" 2226 " res_key: 0x%016Lx does not match" 2227 " existing SA REGISTER res_key:" 2228 " 0x%016Lx\n", res_key, 2229 pr_reg->pr_res_key); 2230 core_scsi3_put_pr_reg(pr_reg); 2231 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2232 return -EINVAL; 2233 } 2234 } 2235 if (spec_i_pt) { 2236 pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT" 2237 " set while sa_res_key=0\n"); 2238 core_scsi3_put_pr_reg(pr_reg); 2239 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2240 return -EINVAL; 2241 } 2242 /* 2243 * An existing ALL_TG_PT=1 registration being released 2244 * must also set ALL_TG_PT=1 in the incoming PROUT. 2245 */ 2246 if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) { 2247 pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1" 2248 " registration exists, but ALL_TG_PT=1 bit not" 2249 " present in received PROUT\n"); 2250 core_scsi3_put_pr_reg(pr_reg); 2251 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2252 return -EINVAL; 2253 } 2254 /* 2255 * Allocate APTPL metadata buffer used for UNREGISTER ops 2256 */ 2257 if (aptpl) { 2258 pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, 2259 GFP_KERNEL); 2260 if (!pr_aptpl_buf) { 2261 pr_err("Unable to allocate" 2262 " pr_aptpl_buf\n"); 2263 core_scsi3_put_pr_reg(pr_reg); 2264 cmd->scsi_sense_reason = 2265 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2266 return -EINVAL; 2267 } 2268 } 2269 /* 2270 * sa_res_key=0 Unregister Reservation Key for registered I_T 2271 * Nexus sa_res_key=1 Change Reservation Key for registered I_T 2272 * Nexus. 2273 */ 2274 if (!sa_res_key) { 2275 pr_holder = core_scsi3_check_implict_release( 2276 cmd->se_dev, pr_reg); 2277 if (pr_holder < 0) { 2278 kfree(pr_aptpl_buf); 2279 core_scsi3_put_pr_reg(pr_reg); 2280 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2281 return -EINVAL; 2282 } 2283 2284 spin_lock(&pr_tmpl->registration_lock); 2285 /* 2286 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port 2287 * and matching pr_res_key. 2288 */ 2289 if (pr_reg->pr_reg_all_tg_pt) { 2290 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp, 2291 &pr_tmpl->registration_list, 2292 pr_reg_list) { 2293 2294 if (!pr_reg_p->pr_reg_all_tg_pt) 2295 continue; 2296 2297 if (pr_reg_p->pr_res_key != res_key) 2298 continue; 2299 2300 if (pr_reg == pr_reg_p) 2301 continue; 2302 2303 if (strcmp(pr_reg->pr_reg_nacl->initiatorname, 2304 pr_reg_p->pr_reg_nacl->initiatorname)) 2305 continue; 2306 2307 __core_scsi3_free_registration(dev, 2308 pr_reg_p, NULL, 0); 2309 } 2310 } 2311 /* 2312 * Release the calling I_T Nexus registration now.. 2313 */ 2314 __core_scsi3_free_registration(cmd->se_dev, pr_reg, 2315 NULL, 1); 2316 /* 2317 * From spc4r17, section 5.7.11.3 Unregistering 2318 * 2319 * If the persistent reservation is a registrants only 2320 * type, the device server shall establish a unit 2321 * attention condition for the initiator port associated 2322 * with every registered I_T nexus except for the I_T 2323 * nexus on which the PERSISTENT RESERVE OUT command was 2324 * received, with the additional sense code set to 2325 * RESERVATIONS RELEASED. 2326 */ 2327 if (pr_holder && 2328 ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || 2329 (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) { 2330 list_for_each_entry(pr_reg_p, 2331 &pr_tmpl->registration_list, 2332 pr_reg_list) { 2333 2334 core_scsi3_ua_allocate( 2335 pr_reg_p->pr_reg_nacl, 2336 pr_reg_p->pr_res_mapped_lun, 2337 0x2A, 2338 ASCQ_2AH_RESERVATIONS_RELEASED); 2339 } 2340 } 2341 spin_unlock(&pr_tmpl->registration_lock); 2342 2343 if (!aptpl) { 2344 pr_tmpl->pr_aptpl_active = 0; 2345 core_scsi3_update_and_write_aptpl(dev, NULL, 0); 2346 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" 2347 " for UNREGISTER\n"); 2348 return 0; 2349 } 2350 2351 ret = core_scsi3_update_and_write_aptpl(dev, 2352 &pr_aptpl_buf[0], 2353 pr_tmpl->pr_aptpl_buf_len); 2354 if (!ret) { 2355 pr_tmpl->pr_aptpl_active = 1; 2356 pr_debug("SPC-3 PR: Set APTPL Bit Activated" 2357 " for UNREGISTER\n"); 2358 } 2359 2360 kfree(pr_aptpl_buf); 2361 return ret; 2362 } else { 2363 /* 2364 * Increment PRgeneration counter for struct se_device" 2365 * upon a successful REGISTER, see spc4r17 section 6.3.2 2366 * READ_KEYS service action. 2367 */ 2368 pr_reg->pr_res_generation = core_scsi3_pr_generation( 2369 cmd->se_dev); 2370 pr_reg->pr_res_key = sa_res_key; 2371 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation" 2372 " Key for %s to: 0x%016Lx PRgeneration:" 2373 " 0x%08x\n", cmd->se_tfo->get_fabric_name(), 2374 (ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "", 2375 pr_reg->pr_reg_nacl->initiatorname, 2376 pr_reg->pr_res_key, pr_reg->pr_res_generation); 2377 2378 if (!aptpl) { 2379 pr_tmpl->pr_aptpl_active = 0; 2380 core_scsi3_update_and_write_aptpl(dev, NULL, 0); 2381 core_scsi3_put_pr_reg(pr_reg); 2382 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" 2383 " for REGISTER\n"); 2384 return 0; 2385 } 2386 2387 ret = core_scsi3_update_and_write_aptpl(dev, 2388 &pr_aptpl_buf[0], 2389 pr_tmpl->pr_aptpl_buf_len); 2390 if (!ret) { 2391 pr_tmpl->pr_aptpl_active = 1; 2392 pr_debug("SPC-3 PR: Set APTPL Bit Activated" 2393 " for REGISTER\n"); 2394 } 2395 2396 kfree(pr_aptpl_buf); 2397 core_scsi3_put_pr_reg(pr_reg); 2398 } 2399 } 2400 return 0; 2401 } 2402 2403 unsigned char *core_scsi3_pr_dump_type(int type) 2404 { 2405 switch (type) { 2406 case PR_TYPE_WRITE_EXCLUSIVE: 2407 return "Write Exclusive Access"; 2408 case PR_TYPE_EXCLUSIVE_ACCESS: 2409 return "Exclusive Access"; 2410 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2411 return "Write Exclusive Access, Registrants Only"; 2412 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2413 return "Exclusive Access, Registrants Only"; 2414 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2415 return "Write Exclusive Access, All Registrants"; 2416 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2417 return "Exclusive Access, All Registrants"; 2418 default: 2419 break; 2420 } 2421 2422 return "Unknown SPC-3 PR Type"; 2423 } 2424 2425 static int core_scsi3_pro_reserve( 2426 struct se_cmd *cmd, 2427 struct se_device *dev, 2428 int type, 2429 int scope, 2430 u64 res_key) 2431 { 2432 struct se_session *se_sess = cmd->se_sess; 2433 struct se_lun *se_lun = cmd->se_lun; 2434 struct t10_pr_registration *pr_reg, *pr_res_holder; 2435 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2436 char i_buf[PR_REG_ISID_ID_LEN]; 2437 int ret, prf_isid; 2438 2439 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2440 2441 if (!se_sess || !se_lun) { 2442 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2443 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2444 return -EINVAL; 2445 } 2446 /* 2447 * Locate the existing *pr_reg via struct se_node_acl pointers 2448 */ 2449 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 2450 se_sess); 2451 if (!pr_reg) { 2452 pr_err("SPC-3 PR: Unable to locate" 2453 " PR_REGISTERED *pr_reg for RESERVE\n"); 2454 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2455 return -EINVAL; 2456 } 2457 /* 2458 * From spc4r17 Section 5.7.9: Reserving: 2459 * 2460 * An application client creates a persistent reservation by issuing 2461 * a PERSISTENT RESERVE OUT command with RESERVE service action through 2462 * a registered I_T nexus with the following parameters: 2463 * a) RESERVATION KEY set to the value of the reservation key that is 2464 * registered with the logical unit for the I_T nexus; and 2465 */ 2466 if (res_key != pr_reg->pr_res_key) { 2467 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx" 2468 " does not match existing SA REGISTER res_key:" 2469 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2470 core_scsi3_put_pr_reg(pr_reg); 2471 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2472 return -EINVAL; 2473 } 2474 /* 2475 * From spc4r17 Section 5.7.9: Reserving: 2476 * 2477 * From above: 2478 * b) TYPE field and SCOPE field set to the persistent reservation 2479 * being created. 2480 * 2481 * Only one persistent reservation is allowed at a time per logical unit 2482 * and that persistent reservation has a scope of LU_SCOPE. 2483 */ 2484 if (scope != PR_SCOPE_LU_SCOPE) { 2485 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 2486 core_scsi3_put_pr_reg(pr_reg); 2487 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 2488 return -EINVAL; 2489 } 2490 /* 2491 * See if we have an existing PR reservation holder pointer at 2492 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration 2493 * *pr_res_holder. 2494 */ 2495 spin_lock(&dev->dev_reservation_lock); 2496 pr_res_holder = dev->dev_pr_res_holder; 2497 if (pr_res_holder) { 2498 /* 2499 * From spc4r17 Section 5.7.9: Reserving: 2500 * 2501 * If the device server receives a PERSISTENT RESERVE OUT 2502 * command from an I_T nexus other than a persistent reservation 2503 * holder (see 5.7.10) that attempts to create a persistent 2504 * reservation when a persistent reservation already exists for 2505 * the logical unit, then the command shall be completed with 2506 * RESERVATION CONFLICT status. 2507 */ 2508 if (pr_res_holder != pr_reg) { 2509 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2510 pr_err("SPC-3 PR: Attempted RESERVE from" 2511 " [%s]: %s while reservation already held by" 2512 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2513 cmd->se_tfo->get_fabric_name(), 2514 se_sess->se_node_acl->initiatorname, 2515 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2516 pr_res_holder->pr_reg_nacl->initiatorname); 2517 2518 spin_unlock(&dev->dev_reservation_lock); 2519 core_scsi3_put_pr_reg(pr_reg); 2520 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2521 return -EINVAL; 2522 } 2523 /* 2524 * From spc4r17 Section 5.7.9: Reserving: 2525 * 2526 * If a persistent reservation holder attempts to modify the 2527 * type or scope of an existing persistent reservation, the 2528 * command shall be completed with RESERVATION CONFLICT status. 2529 */ 2530 if ((pr_res_holder->pr_res_type != type) || 2531 (pr_res_holder->pr_res_scope != scope)) { 2532 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2533 pr_err("SPC-3 PR: Attempted RESERVE from" 2534 " [%s]: %s trying to change TYPE and/or SCOPE," 2535 " while reservation already held by [%s]: %s," 2536 " returning RESERVATION_CONFLICT\n", 2537 cmd->se_tfo->get_fabric_name(), 2538 se_sess->se_node_acl->initiatorname, 2539 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2540 pr_res_holder->pr_reg_nacl->initiatorname); 2541 2542 spin_unlock(&dev->dev_reservation_lock); 2543 core_scsi3_put_pr_reg(pr_reg); 2544 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2545 return -EINVAL; 2546 } 2547 /* 2548 * From spc4r17 Section 5.7.9: Reserving: 2549 * 2550 * If the device server receives a PERSISTENT RESERVE OUT 2551 * command with RESERVE service action where the TYPE field and 2552 * the SCOPE field contain the same values as the existing type 2553 * and scope from a persistent reservation holder, it shall not 2554 * make any change to the existing persistent reservation and 2555 * shall completethe command with GOOD status. 2556 */ 2557 spin_unlock(&dev->dev_reservation_lock); 2558 core_scsi3_put_pr_reg(pr_reg); 2559 return 0; 2560 } 2561 /* 2562 * Otherwise, our *pr_reg becomes the PR reservation holder for said 2563 * TYPE/SCOPE. Also set the received scope and type in *pr_reg. 2564 */ 2565 pr_reg->pr_res_scope = scope; 2566 pr_reg->pr_res_type = type; 2567 pr_reg->pr_res_holder = 1; 2568 dev->dev_pr_res_holder = pr_reg; 2569 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2570 PR_REG_ISID_ID_LEN); 2571 2572 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new" 2573 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2574 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type), 2575 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2576 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n", 2577 cmd->se_tfo->get_fabric_name(), 2578 se_sess->se_node_acl->initiatorname, 2579 (prf_isid) ? &i_buf[0] : ""); 2580 spin_unlock(&dev->dev_reservation_lock); 2581 2582 if (pr_tmpl->pr_aptpl_active) { 2583 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2584 &pr_reg->pr_aptpl_buf[0], 2585 pr_tmpl->pr_aptpl_buf_len); 2586 if (!ret) 2587 pr_debug("SPC-3 PR: Updated APTPL metadata" 2588 " for RESERVE\n"); 2589 } 2590 2591 core_scsi3_put_pr_reg(pr_reg); 2592 return 0; 2593 } 2594 2595 static int core_scsi3_emulate_pro_reserve( 2596 struct se_cmd *cmd, 2597 int type, 2598 int scope, 2599 u64 res_key) 2600 { 2601 struct se_device *dev = cmd->se_dev; 2602 int ret = 0; 2603 2604 switch (type) { 2605 case PR_TYPE_WRITE_EXCLUSIVE: 2606 case PR_TYPE_EXCLUSIVE_ACCESS: 2607 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 2608 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 2609 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 2610 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 2611 ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key); 2612 break; 2613 default: 2614 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:" 2615 " 0x%02x\n", type); 2616 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2617 return -EINVAL; 2618 } 2619 2620 return ret; 2621 } 2622 2623 /* 2624 * Called with struct se_device->dev_reservation_lock held. 2625 */ 2626 static void __core_scsi3_complete_pro_release( 2627 struct se_device *dev, 2628 struct se_node_acl *se_nacl, 2629 struct t10_pr_registration *pr_reg, 2630 int explict) 2631 { 2632 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo; 2633 char i_buf[PR_REG_ISID_ID_LEN]; 2634 int prf_isid; 2635 2636 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2637 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2638 PR_REG_ISID_ID_LEN); 2639 /* 2640 * Go ahead and release the current PR reservation holder. 2641 */ 2642 dev->dev_pr_res_holder = NULL; 2643 2644 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared" 2645 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2646 tfo->get_fabric_name(), (explict) ? "explict" : "implict", 2647 core_scsi3_pr_dump_type(pr_reg->pr_res_type), 2648 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2649 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n", 2650 tfo->get_fabric_name(), se_nacl->initiatorname, 2651 (prf_isid) ? &i_buf[0] : ""); 2652 /* 2653 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE 2654 */ 2655 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0; 2656 } 2657 2658 static int core_scsi3_emulate_pro_release( 2659 struct se_cmd *cmd, 2660 int type, 2661 int scope, 2662 u64 res_key) 2663 { 2664 struct se_device *dev = cmd->se_dev; 2665 struct se_session *se_sess = cmd->se_sess; 2666 struct se_lun *se_lun = cmd->se_lun; 2667 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; 2668 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2669 int ret, all_reg = 0; 2670 2671 if (!se_sess || !se_lun) { 2672 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 2673 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2674 return -EINVAL; 2675 } 2676 /* 2677 * Locate the existing *pr_reg via struct se_node_acl pointers 2678 */ 2679 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess); 2680 if (!pr_reg) { 2681 pr_err("SPC-3 PR: Unable to locate" 2682 " PR_REGISTERED *pr_reg for RELEASE\n"); 2683 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2684 return -EINVAL; 2685 } 2686 /* 2687 * From spc4r17 Section 5.7.11.2 Releasing: 2688 * 2689 * If there is no persistent reservation or in response to a persistent 2690 * reservation release request from a registered I_T nexus that is not a 2691 * persistent reservation holder (see 5.7.10), the device server shall 2692 * do the following: 2693 * 2694 * a) Not release the persistent reservation, if any; 2695 * b) Not remove any registrations; and 2696 * c) Complete the command with GOOD status. 2697 */ 2698 spin_lock(&dev->dev_reservation_lock); 2699 pr_res_holder = dev->dev_pr_res_holder; 2700 if (!pr_res_holder) { 2701 /* 2702 * No persistent reservation, return GOOD status. 2703 */ 2704 spin_unlock(&dev->dev_reservation_lock); 2705 core_scsi3_put_pr_reg(pr_reg); 2706 return 0; 2707 } 2708 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 2709 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 2710 all_reg = 1; 2711 2712 if ((all_reg == 0) && (pr_res_holder != pr_reg)) { 2713 /* 2714 * Non 'All Registrants' PR Type cases.. 2715 * Release request from a registered I_T nexus that is not a 2716 * persistent reservation holder. return GOOD status. 2717 */ 2718 spin_unlock(&dev->dev_reservation_lock); 2719 core_scsi3_put_pr_reg(pr_reg); 2720 return 0; 2721 } 2722 /* 2723 * From spc4r17 Section 5.7.11.2 Releasing: 2724 * 2725 * Only the persistent reservation holder (see 5.7.10) is allowed to 2726 * release a persistent reservation. 2727 * 2728 * An application client releases the persistent reservation by issuing 2729 * a PERSISTENT RESERVE OUT command with RELEASE service action through 2730 * an I_T nexus that is a persistent reservation holder with the 2731 * following parameters: 2732 * 2733 * a) RESERVATION KEY field set to the value of the reservation key 2734 * that is registered with the logical unit for the I_T nexus; 2735 */ 2736 if (res_key != pr_reg->pr_res_key) { 2737 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx" 2738 " does not match existing SA REGISTER res_key:" 2739 " 0x%016Lx\n", res_key, pr_reg->pr_res_key); 2740 spin_unlock(&dev->dev_reservation_lock); 2741 core_scsi3_put_pr_reg(pr_reg); 2742 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2743 return -EINVAL; 2744 } 2745 /* 2746 * From spc4r17 Section 5.7.11.2 Releasing and above: 2747 * 2748 * b) TYPE field and SCOPE field set to match the persistent 2749 * reservation being released. 2750 */ 2751 if ((pr_res_holder->pr_res_type != type) || 2752 (pr_res_holder->pr_res_scope != scope)) { 2753 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2754 pr_err("SPC-3 PR RELEASE: Attempted to release" 2755 " reservation from [%s]: %s with different TYPE " 2756 "and/or SCOPE while reservation already held by" 2757 " [%s]: %s, returning RESERVATION_CONFLICT\n", 2758 cmd->se_tfo->get_fabric_name(), 2759 se_sess->se_node_acl->initiatorname, 2760 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(), 2761 pr_res_holder->pr_reg_nacl->initiatorname); 2762 2763 spin_unlock(&dev->dev_reservation_lock); 2764 core_scsi3_put_pr_reg(pr_reg); 2765 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2766 return -EINVAL; 2767 } 2768 /* 2769 * In response to a persistent reservation release request from the 2770 * persistent reservation holder the device server shall perform a 2771 * release by doing the following as an uninterrupted series of actions: 2772 * a) Release the persistent reservation; 2773 * b) Not remove any registration(s); 2774 * c) If the released persistent reservation is a registrants only type 2775 * or all registrants type persistent reservation, 2776 * the device server shall establish a unit attention condition for 2777 * the initiator port associated with every regis- 2778 * tered I_T nexus other than I_T nexus on which the PERSISTENT 2779 * RESERVE OUT command with RELEASE service action was received, 2780 * with the additional sense code set to RESERVATIONS RELEASED; and 2781 * d) If the persistent reservation is of any other type, the device 2782 * server shall not establish a unit attention condition. 2783 */ 2784 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl, 2785 pr_reg, 1); 2786 2787 spin_unlock(&dev->dev_reservation_lock); 2788 2789 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) && 2790 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) && 2791 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && 2792 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 2793 /* 2794 * If no UNIT ATTENTION conditions will be established for 2795 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS 2796 * go ahead and check for APTPL=1 update+write below 2797 */ 2798 goto write_aptpl; 2799 } 2800 2801 spin_lock(&pr_tmpl->registration_lock); 2802 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list, 2803 pr_reg_list) { 2804 /* 2805 * Do not establish a UNIT ATTENTION condition 2806 * for the calling I_T Nexus 2807 */ 2808 if (pr_reg_p == pr_reg) 2809 continue; 2810 2811 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl, 2812 pr_reg_p->pr_res_mapped_lun, 2813 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED); 2814 } 2815 spin_unlock(&pr_tmpl->registration_lock); 2816 2817 write_aptpl: 2818 if (pr_tmpl->pr_aptpl_active) { 2819 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 2820 &pr_reg->pr_aptpl_buf[0], 2821 pr_tmpl->pr_aptpl_buf_len); 2822 if (!ret) 2823 pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n"); 2824 } 2825 2826 core_scsi3_put_pr_reg(pr_reg); 2827 return 0; 2828 } 2829 2830 static int core_scsi3_emulate_pro_clear( 2831 struct se_cmd *cmd, 2832 u64 res_key) 2833 { 2834 struct se_device *dev = cmd->se_dev; 2835 struct se_node_acl *pr_reg_nacl; 2836 struct se_session *se_sess = cmd->se_sess; 2837 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 2838 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 2839 u32 pr_res_mapped_lun = 0; 2840 int calling_it_nexus = 0; 2841 /* 2842 * Locate the existing *pr_reg via struct se_node_acl pointers 2843 */ 2844 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, 2845 se_sess->se_node_acl, se_sess); 2846 if (!pr_reg_n) { 2847 pr_err("SPC-3 PR: Unable to locate" 2848 " PR_REGISTERED *pr_reg for CLEAR\n"); 2849 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2850 return -EINVAL; 2851 } 2852 /* 2853 * From spc4r17 section 5.7.11.6, Clearing: 2854 * 2855 * Any application client may release the persistent reservation and 2856 * remove all registrations from a device server by issuing a 2857 * PERSISTENT RESERVE OUT command with CLEAR service action through a 2858 * registered I_T nexus with the following parameter: 2859 * 2860 * a) RESERVATION KEY field set to the value of the reservation key 2861 * that is registered with the logical unit for the I_T nexus. 2862 */ 2863 if (res_key != pr_reg_n->pr_res_key) { 2864 pr_err("SPC-3 PR REGISTER: Received" 2865 " res_key: 0x%016Lx does not match" 2866 " existing SA REGISTER res_key:" 2867 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key); 2868 core_scsi3_put_pr_reg(pr_reg_n); 2869 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 2870 return -EINVAL; 2871 } 2872 /* 2873 * a) Release the persistent reservation, if any; 2874 */ 2875 spin_lock(&dev->dev_reservation_lock); 2876 pr_res_holder = dev->dev_pr_res_holder; 2877 if (pr_res_holder) { 2878 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; 2879 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 2880 pr_res_holder, 0); 2881 } 2882 spin_unlock(&dev->dev_reservation_lock); 2883 /* 2884 * b) Remove all registration(s) (see spc4r17 5.7.7); 2885 */ 2886 spin_lock(&pr_tmpl->registration_lock); 2887 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 2888 &pr_tmpl->registration_list, pr_reg_list) { 2889 2890 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 2891 pr_reg_nacl = pr_reg->pr_reg_nacl; 2892 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 2893 __core_scsi3_free_registration(dev, pr_reg, NULL, 2894 calling_it_nexus); 2895 /* 2896 * e) Establish a unit attention condition for the initiator 2897 * port associated with every registered I_T nexus other 2898 * than the I_T nexus on which the PERSISTENT RESERVE OUT 2899 * command with CLEAR service action was received, with the 2900 * additional sense code set to RESERVATIONS PREEMPTED. 2901 */ 2902 if (!calling_it_nexus) 2903 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 2904 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED); 2905 } 2906 spin_unlock(&pr_tmpl->registration_lock); 2907 2908 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", 2909 cmd->se_tfo->get_fabric_name()); 2910 2911 if (pr_tmpl->pr_aptpl_active) { 2912 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 2913 pr_debug("SPC-3 PR: Updated APTPL metadata" 2914 " for CLEAR\n"); 2915 } 2916 2917 core_scsi3_pr_generation(dev); 2918 return 0; 2919 } 2920 2921 /* 2922 * Called with struct se_device->dev_reservation_lock held. 2923 */ 2924 static void __core_scsi3_complete_pro_preempt( 2925 struct se_device *dev, 2926 struct t10_pr_registration *pr_reg, 2927 struct list_head *preempt_and_abort_list, 2928 int type, 2929 int scope, 2930 int abort) 2931 { 2932 struct se_node_acl *nacl = pr_reg->pr_reg_nacl; 2933 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo; 2934 char i_buf[PR_REG_ISID_ID_LEN]; 2935 int prf_isid; 2936 2937 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 2938 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 2939 PR_REG_ISID_ID_LEN); 2940 /* 2941 * Do an implict RELEASE of the existing reservation. 2942 */ 2943 if (dev->dev_pr_res_holder) 2944 __core_scsi3_complete_pro_release(dev, nacl, 2945 dev->dev_pr_res_holder, 0); 2946 2947 dev->dev_pr_res_holder = pr_reg; 2948 pr_reg->pr_res_holder = 1; 2949 pr_reg->pr_res_type = type; 2950 pr_reg->pr_res_scope = scope; 2951 2952 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new" 2953 " reservation holder TYPE: %s ALL_TG_PT: %d\n", 2954 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", 2955 core_scsi3_pr_dump_type(type), 2956 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0); 2957 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n", 2958 tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "", 2959 nacl->initiatorname, (prf_isid) ? &i_buf[0] : ""); 2960 /* 2961 * For PREEMPT_AND_ABORT, add the preempting reservation's 2962 * struct t10_pr_registration to the list that will be compared 2963 * against received CDBs.. 2964 */ 2965 if (preempt_and_abort_list) 2966 list_add_tail(&pr_reg->pr_reg_abort_list, 2967 preempt_and_abort_list); 2968 } 2969 2970 static void core_scsi3_release_preempt_and_abort( 2971 struct list_head *preempt_and_abort_list, 2972 struct t10_pr_registration *pr_reg_holder) 2973 { 2974 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 2975 2976 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list, 2977 pr_reg_abort_list) { 2978 2979 list_del(&pr_reg->pr_reg_abort_list); 2980 if (pr_reg_holder == pr_reg) 2981 continue; 2982 if (pr_reg->pr_res_holder) { 2983 pr_warn("pr_reg->pr_res_holder still set\n"); 2984 continue; 2985 } 2986 2987 pr_reg->pr_reg_deve = NULL; 2988 pr_reg->pr_reg_nacl = NULL; 2989 kfree(pr_reg->pr_aptpl_buf); 2990 kmem_cache_free(t10_pr_reg_cache, pr_reg); 2991 } 2992 } 2993 2994 static int core_scsi3_pro_preempt( 2995 struct se_cmd *cmd, 2996 int type, 2997 int scope, 2998 u64 res_key, 2999 u64 sa_res_key, 3000 int abort) 3001 { 3002 struct se_device *dev = cmd->se_dev; 3003 struct se_node_acl *pr_reg_nacl; 3004 struct se_session *se_sess = cmd->se_sess; 3005 LIST_HEAD(preempt_and_abort_list); 3006 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder; 3007 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 3008 u32 pr_res_mapped_lun = 0; 3009 int all_reg = 0, calling_it_nexus = 0, released_regs = 0; 3010 int prh_type = 0, prh_scope = 0, ret; 3011 3012 if (!se_sess) { 3013 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3014 return -EINVAL; 3015 } 3016 3017 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3018 se_sess); 3019 if (!pr_reg_n) { 3020 pr_err("SPC-3 PR: Unable to locate" 3021 " PR_REGISTERED *pr_reg for PREEMPT%s\n", 3022 (abort) ? "_AND_ABORT" : ""); 3023 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3024 return -EINVAL; 3025 } 3026 if (pr_reg_n->pr_res_key != res_key) { 3027 core_scsi3_put_pr_reg(pr_reg_n); 3028 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3029 return -EINVAL; 3030 } 3031 if (scope != PR_SCOPE_LU_SCOPE) { 3032 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope); 3033 core_scsi3_put_pr_reg(pr_reg_n); 3034 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3035 return -EINVAL; 3036 } 3037 3038 spin_lock(&dev->dev_reservation_lock); 3039 pr_res_holder = dev->dev_pr_res_holder; 3040 if (pr_res_holder && 3041 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3042 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) 3043 all_reg = 1; 3044 3045 if (!all_reg && !sa_res_key) { 3046 spin_unlock(&dev->dev_reservation_lock); 3047 core_scsi3_put_pr_reg(pr_reg_n); 3048 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3049 return -EINVAL; 3050 } 3051 /* 3052 * From spc4r17, section 5.7.11.4.4 Removing Registrations: 3053 * 3054 * If the SERVICE ACTION RESERVATION KEY field does not identify a 3055 * persistent reservation holder or there is no persistent reservation 3056 * holder (i.e., there is no persistent reservation), then the device 3057 * server shall perform a preempt by doing the following in an 3058 * uninterrupted series of actions. (See below..) 3059 */ 3060 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) { 3061 /* 3062 * No existing or SA Reservation Key matching reservations.. 3063 * 3064 * PROUT SA PREEMPT with All Registrant type reservations are 3065 * allowed to be processed without a matching SA Reservation Key 3066 */ 3067 spin_lock(&pr_tmpl->registration_lock); 3068 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3069 &pr_tmpl->registration_list, pr_reg_list) { 3070 /* 3071 * Removing of registrations in non all registrants 3072 * type reservations without a matching SA reservation 3073 * key. 3074 * 3075 * a) Remove the registrations for all I_T nexuses 3076 * specified by the SERVICE ACTION RESERVATION KEY 3077 * field; 3078 * b) Ignore the contents of the SCOPE and TYPE fields; 3079 * c) Process tasks as defined in 5.7.1; and 3080 * d) Establish a unit attention condition for the 3081 * initiator port associated with every I_T nexus 3082 * that lost its registration other than the I_T 3083 * nexus on which the PERSISTENT RESERVE OUT command 3084 * was received, with the additional sense code set 3085 * to REGISTRATIONS PREEMPTED. 3086 */ 3087 if (!all_reg) { 3088 if (pr_reg->pr_res_key != sa_res_key) 3089 continue; 3090 3091 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3092 pr_reg_nacl = pr_reg->pr_reg_nacl; 3093 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3094 __core_scsi3_free_registration(dev, pr_reg, 3095 (abort) ? &preempt_and_abort_list : 3096 NULL, calling_it_nexus); 3097 released_regs++; 3098 } else { 3099 /* 3100 * Case for any existing all registrants type 3101 * reservation, follow logic in spc4r17 section 3102 * 5.7.11.4 Preempting, Table 52 and Figure 7. 3103 * 3104 * For a ZERO SA Reservation key, release 3105 * all other registrations and do an implict 3106 * release of active persistent reservation. 3107 * 3108 * For a non-ZERO SA Reservation key, only 3109 * release the matching reservation key from 3110 * registrations. 3111 */ 3112 if ((sa_res_key) && 3113 (pr_reg->pr_res_key != sa_res_key)) 3114 continue; 3115 3116 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3117 if (calling_it_nexus) 3118 continue; 3119 3120 pr_reg_nacl = pr_reg->pr_reg_nacl; 3121 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3122 __core_scsi3_free_registration(dev, pr_reg, 3123 (abort) ? &preempt_and_abort_list : 3124 NULL, 0); 3125 released_regs++; 3126 } 3127 if (!calling_it_nexus) 3128 core_scsi3_ua_allocate(pr_reg_nacl, 3129 pr_res_mapped_lun, 0x2A, 3130 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3131 } 3132 spin_unlock(&pr_tmpl->registration_lock); 3133 /* 3134 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or 3135 * a PREEMPT AND ABORT service action sets the SERVICE ACTION 3136 * RESERVATION KEY field to a value that does not match any 3137 * registered reservation key, then the device server shall 3138 * complete the command with RESERVATION CONFLICT status. 3139 */ 3140 if (!released_regs) { 3141 spin_unlock(&dev->dev_reservation_lock); 3142 core_scsi3_put_pr_reg(pr_reg_n); 3143 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3144 return -EINVAL; 3145 } 3146 /* 3147 * For an existing all registrants type reservation 3148 * with a zero SA rservation key, preempt the existing 3149 * reservation with the new PR type and scope. 3150 */ 3151 if (pr_res_holder && all_reg && !(sa_res_key)) { 3152 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3153 (abort) ? &preempt_and_abort_list : NULL, 3154 type, scope, abort); 3155 3156 if (abort) 3157 core_scsi3_release_preempt_and_abort( 3158 &preempt_and_abort_list, pr_reg_n); 3159 } 3160 spin_unlock(&dev->dev_reservation_lock); 3161 3162 if (pr_tmpl->pr_aptpl_active) { 3163 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3164 &pr_reg_n->pr_aptpl_buf[0], 3165 pr_tmpl->pr_aptpl_buf_len); 3166 if (!ret) 3167 pr_debug("SPC-3 PR: Updated APTPL" 3168 " metadata for PREEMPT%s\n", (abort) ? 3169 "_AND_ABORT" : ""); 3170 } 3171 3172 core_scsi3_put_pr_reg(pr_reg_n); 3173 core_scsi3_pr_generation(cmd->se_dev); 3174 return 0; 3175 } 3176 /* 3177 * The PREEMPTing SA reservation key matches that of the 3178 * existing persistent reservation, first, we check if 3179 * we are preempting our own reservation. 3180 * From spc4r17, section 5.7.11.4.3 Preempting 3181 * persistent reservations and registration handling 3182 * 3183 * If an all registrants persistent reservation is not 3184 * present, it is not an error for the persistent 3185 * reservation holder to preempt itself (i.e., a 3186 * PERSISTENT RESERVE OUT with a PREEMPT service action 3187 * or a PREEMPT AND ABORT service action with the 3188 * SERVICE ACTION RESERVATION KEY value equal to the 3189 * persistent reservation holder's reservation key that 3190 * is received from the persistent reservation holder). 3191 * In that case, the device server shall establish the 3192 * new persistent reservation and maintain the 3193 * registration. 3194 */ 3195 prh_type = pr_res_holder->pr_res_type; 3196 prh_scope = pr_res_holder->pr_res_scope; 3197 /* 3198 * If the SERVICE ACTION RESERVATION KEY field identifies a 3199 * persistent reservation holder (see 5.7.10), the device 3200 * server shall perform a preempt by doing the following as 3201 * an uninterrupted series of actions: 3202 * 3203 * a) Release the persistent reservation for the holder 3204 * identified by the SERVICE ACTION RESERVATION KEY field; 3205 */ 3206 if (pr_reg_n != pr_res_holder) 3207 __core_scsi3_complete_pro_release(dev, 3208 pr_res_holder->pr_reg_nacl, 3209 dev->dev_pr_res_holder, 0); 3210 /* 3211 * b) Remove the registrations for all I_T nexuses identified 3212 * by the SERVICE ACTION RESERVATION KEY field, except the 3213 * I_T nexus that is being used for the PERSISTENT RESERVE 3214 * OUT command. If an all registrants persistent reservation 3215 * is present and the SERVICE ACTION RESERVATION KEY field 3216 * is set to zero, then all registrations shall be removed 3217 * except for that of the I_T nexus that is being used for 3218 * the PERSISTENT RESERVE OUT command; 3219 */ 3220 spin_lock(&pr_tmpl->registration_lock); 3221 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3222 &pr_tmpl->registration_list, pr_reg_list) { 3223 3224 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3225 if (calling_it_nexus) 3226 continue; 3227 3228 if (pr_reg->pr_res_key != sa_res_key) 3229 continue; 3230 3231 pr_reg_nacl = pr_reg->pr_reg_nacl; 3232 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun; 3233 __core_scsi3_free_registration(dev, pr_reg, 3234 (abort) ? &preempt_and_abort_list : NULL, 3235 calling_it_nexus); 3236 /* 3237 * e) Establish a unit attention condition for the initiator 3238 * port associated with every I_T nexus that lost its 3239 * persistent reservation and/or registration, with the 3240 * additional sense code set to REGISTRATIONS PREEMPTED; 3241 */ 3242 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A, 3243 ASCQ_2AH_REGISTRATIONS_PREEMPTED); 3244 } 3245 spin_unlock(&pr_tmpl->registration_lock); 3246 /* 3247 * c) Establish a persistent reservation for the preempting 3248 * I_T nexus using the contents of the SCOPE and TYPE fields; 3249 */ 3250 __core_scsi3_complete_pro_preempt(dev, pr_reg_n, 3251 (abort) ? &preempt_and_abort_list : NULL, 3252 type, scope, abort); 3253 /* 3254 * d) Process tasks as defined in 5.7.1; 3255 * e) See above.. 3256 * f) If the type or scope has changed, then for every I_T nexus 3257 * whose reservation key was not removed, except for the I_T 3258 * nexus on which the PERSISTENT RESERVE OUT command was 3259 * received, the device server shall establish a unit 3260 * attention condition for the initiator port associated with 3261 * that I_T nexus, with the additional sense code set to 3262 * RESERVATIONS RELEASED. If the type or scope have not 3263 * changed, then no unit attention condition(s) shall be 3264 * established for this reason. 3265 */ 3266 if ((prh_type != type) || (prh_scope != scope)) { 3267 spin_lock(&pr_tmpl->registration_lock); 3268 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 3269 &pr_tmpl->registration_list, pr_reg_list) { 3270 3271 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0; 3272 if (calling_it_nexus) 3273 continue; 3274 3275 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl, 3276 pr_reg->pr_res_mapped_lun, 0x2A, 3277 ASCQ_2AH_RESERVATIONS_RELEASED); 3278 } 3279 spin_unlock(&pr_tmpl->registration_lock); 3280 } 3281 spin_unlock(&dev->dev_reservation_lock); 3282 /* 3283 * Call LUN_RESET logic upon list of struct t10_pr_registration, 3284 * All received CDBs for the matching existing reservation and 3285 * registrations undergo ABORT_TASK logic. 3286 * 3287 * From there, core_scsi3_release_preempt_and_abort() will 3288 * release every registration in the list (which have already 3289 * been removed from the primary pr_reg list), except the 3290 * new persistent reservation holder, the calling Initiator Port. 3291 */ 3292 if (abort) { 3293 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd); 3294 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list, 3295 pr_reg_n); 3296 } 3297 3298 if (pr_tmpl->pr_aptpl_active) { 3299 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3300 &pr_reg_n->pr_aptpl_buf[0], 3301 pr_tmpl->pr_aptpl_buf_len); 3302 if (!ret) 3303 pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT" 3304 "%s\n", (abort) ? "_AND_ABORT" : ""); 3305 } 3306 3307 core_scsi3_put_pr_reg(pr_reg_n); 3308 core_scsi3_pr_generation(cmd->se_dev); 3309 return 0; 3310 } 3311 3312 static int core_scsi3_emulate_pro_preempt( 3313 struct se_cmd *cmd, 3314 int type, 3315 int scope, 3316 u64 res_key, 3317 u64 sa_res_key, 3318 int abort) 3319 { 3320 int ret = 0; 3321 3322 switch (type) { 3323 case PR_TYPE_WRITE_EXCLUSIVE: 3324 case PR_TYPE_EXCLUSIVE_ACCESS: 3325 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: 3326 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: 3327 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: 3328 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: 3329 ret = core_scsi3_pro_preempt(cmd, type, scope, 3330 res_key, sa_res_key, abort); 3331 break; 3332 default: 3333 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s" 3334 " Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type); 3335 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3336 return -EINVAL; 3337 } 3338 3339 return ret; 3340 } 3341 3342 3343 static int core_scsi3_emulate_pro_register_and_move( 3344 struct se_cmd *cmd, 3345 u64 res_key, 3346 u64 sa_res_key, 3347 int aptpl, 3348 int unreg) 3349 { 3350 struct se_session *se_sess = cmd->se_sess; 3351 struct se_device *dev = cmd->se_dev; 3352 struct se_dev_entry *dest_se_deve = NULL; 3353 struct se_lun *se_lun = cmd->se_lun; 3354 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL; 3355 struct se_port *se_port; 3356 struct se_portal_group *se_tpg, *dest_se_tpg = NULL; 3357 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops; 3358 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg; 3359 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 3360 unsigned char *buf; 3361 unsigned char *initiator_str; 3362 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN]; 3363 u32 tid_len, tmp_tid_len; 3364 int new_reg = 0, type, scope, ret, matching_iname, prf_isid; 3365 unsigned short rtpi; 3366 unsigned char proto_ident; 3367 3368 if (!se_sess || !se_lun) { 3369 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n"); 3370 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3371 return -EINVAL; 3372 } 3373 memset(dest_iport, 0, 64); 3374 memset(i_buf, 0, PR_REG_ISID_ID_LEN); 3375 se_tpg = se_sess->se_tpg; 3376 tf_ops = se_tpg->se_tpg_tfo; 3377 /* 3378 * Follow logic from spc4r17 Section 5.7.8, Table 50 -- 3379 * Register behaviors for a REGISTER AND MOVE service action 3380 * 3381 * Locate the existing *pr_reg via struct se_node_acl pointers 3382 */ 3383 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, 3384 se_sess); 3385 if (!pr_reg) { 3386 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED" 3387 " *pr_reg for REGISTER_AND_MOVE\n"); 3388 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3389 return -EINVAL; 3390 } 3391 /* 3392 * The provided reservation key much match the existing reservation key 3393 * provided during this initiator's I_T nexus registration. 3394 */ 3395 if (res_key != pr_reg->pr_res_key) { 3396 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received" 3397 " res_key: 0x%016Lx does not match existing SA REGISTER" 3398 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key); 3399 core_scsi3_put_pr_reg(pr_reg); 3400 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3401 return -EINVAL; 3402 } 3403 /* 3404 * The service active reservation key needs to be non zero 3405 */ 3406 if (!sa_res_key) { 3407 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero" 3408 " sa_res_key\n"); 3409 core_scsi3_put_pr_reg(pr_reg); 3410 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3411 return -EINVAL; 3412 } 3413 3414 /* 3415 * Determine the Relative Target Port Identifier where the reservation 3416 * will be moved to for the TransportID containing SCSI initiator WWN 3417 * information. 3418 */ 3419 buf = transport_kmap_data_sg(cmd); 3420 rtpi = (buf[18] & 0xff) << 8; 3421 rtpi |= buf[19] & 0xff; 3422 tid_len = (buf[20] & 0xff) << 24; 3423 tid_len |= (buf[21] & 0xff) << 16; 3424 tid_len |= (buf[22] & 0xff) << 8; 3425 tid_len |= buf[23] & 0xff; 3426 transport_kunmap_data_sg(cmd); 3427 buf = NULL; 3428 3429 if ((tid_len + 24) != cmd->data_length) { 3430 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" 3431 " does not equal CDB data_length: %u\n", tid_len, 3432 cmd->data_length); 3433 core_scsi3_put_pr_reg(pr_reg); 3434 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3435 return -EINVAL; 3436 } 3437 3438 spin_lock(&dev->se_port_lock); 3439 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) { 3440 if (se_port->sep_rtpi != rtpi) 3441 continue; 3442 dest_se_tpg = se_port->sep_tpg; 3443 if (!dest_se_tpg) 3444 continue; 3445 dest_tf_ops = dest_se_tpg->se_tpg_tfo; 3446 if (!dest_tf_ops) 3447 continue; 3448 3449 atomic_inc(&dest_se_tpg->tpg_pr_ref_count); 3450 smp_mb__after_atomic_inc(); 3451 spin_unlock(&dev->se_port_lock); 3452 3453 ret = core_scsi3_tpg_depend_item(dest_se_tpg); 3454 if (ret != 0) { 3455 pr_err("core_scsi3_tpg_depend_item() failed" 3456 " for dest_se_tpg\n"); 3457 atomic_dec(&dest_se_tpg->tpg_pr_ref_count); 3458 smp_mb__after_atomic_dec(); 3459 core_scsi3_put_pr_reg(pr_reg); 3460 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3461 return -EINVAL; 3462 } 3463 3464 spin_lock(&dev->se_port_lock); 3465 break; 3466 } 3467 spin_unlock(&dev->se_port_lock); 3468 3469 if (!dest_se_tpg || !dest_tf_ops) { 3470 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3471 " fabric ops from Relative Target Port Identifier:" 3472 " %hu\n", rtpi); 3473 core_scsi3_put_pr_reg(pr_reg); 3474 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3475 return -EINVAL; 3476 } 3477 3478 buf = transport_kmap_data_sg(cmd); 3479 proto_ident = (buf[24] & 0x0f); 3480 3481 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:" 3482 " 0x%02x\n", proto_ident); 3483 3484 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) { 3485 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received" 3486 " proto_ident: 0x%02x does not match ident: 0x%02x" 3487 " from fabric: %s\n", proto_ident, 3488 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg), 3489 dest_tf_ops->get_fabric_name()); 3490 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3491 ret = -EINVAL; 3492 goto out; 3493 } 3494 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) { 3495 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not" 3496 " containg a valid tpg_parse_pr_out_transport_id" 3497 " function pointer\n"); 3498 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3499 ret = -EINVAL; 3500 goto out; 3501 } 3502 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg, 3503 (const char *)&buf[24], &tmp_tid_len, &iport_ptr); 3504 if (!initiator_str) { 3505 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate" 3506 " initiator_str from Transport ID\n"); 3507 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3508 ret = -EINVAL; 3509 goto out; 3510 } 3511 3512 transport_kunmap_data_sg(cmd); 3513 buf = NULL; 3514 3515 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s" 3516 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ? 3517 "port" : "device", initiator_str, (iport_ptr != NULL) ? 3518 iport_ptr : ""); 3519 /* 3520 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3521 * action specifies a TransportID that is the same as the initiator port 3522 * of the I_T nexus for the command received, then the command shall 3523 * be terminated with CHECK CONDITION status, with the sense key set to 3524 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD 3525 * IN PARAMETER LIST. 3526 */ 3527 pr_reg_nacl = pr_reg->pr_reg_nacl; 3528 matching_iname = (!strcmp(initiator_str, 3529 pr_reg_nacl->initiatorname)) ? 1 : 0; 3530 if (!matching_iname) 3531 goto after_iport_check; 3532 3533 if (!iport_ptr || !pr_reg->isid_present_at_reg) { 3534 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s" 3535 " matches: %s on received I_T Nexus\n", initiator_str, 3536 pr_reg_nacl->initiatorname); 3537 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3538 ret = -EINVAL; 3539 goto out; 3540 } 3541 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) { 3542 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s" 3543 " matches: %s %s on received I_T Nexus\n", 3544 initiator_str, iport_ptr, pr_reg_nacl->initiatorname, 3545 pr_reg->pr_reg_isid); 3546 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3547 ret = -EINVAL; 3548 goto out; 3549 } 3550 after_iport_check: 3551 /* 3552 * Locate the destination struct se_node_acl from the received Transport ID 3553 */ 3554 spin_lock_irq(&dest_se_tpg->acl_node_lock); 3555 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg, 3556 initiator_str); 3557 if (dest_node_acl) { 3558 atomic_inc(&dest_node_acl->acl_pr_ref_count); 3559 smp_mb__after_atomic_inc(); 3560 } 3561 spin_unlock_irq(&dest_se_tpg->acl_node_lock); 3562 3563 if (!dest_node_acl) { 3564 pr_err("Unable to locate %s dest_node_acl for" 3565 " TransportID%s\n", dest_tf_ops->get_fabric_name(), 3566 initiator_str); 3567 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3568 ret = -EINVAL; 3569 goto out; 3570 } 3571 ret = core_scsi3_nodeacl_depend_item(dest_node_acl); 3572 if (ret != 0) { 3573 pr_err("core_scsi3_nodeacl_depend_item() for" 3574 " dest_node_acl\n"); 3575 atomic_dec(&dest_node_acl->acl_pr_ref_count); 3576 smp_mb__after_atomic_dec(); 3577 dest_node_acl = NULL; 3578 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3579 ret = -EINVAL; 3580 goto out; 3581 } 3582 3583 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:" 3584 " %s from TransportID\n", dest_tf_ops->get_fabric_name(), 3585 dest_node_acl->initiatorname); 3586 3587 /* 3588 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET 3589 * PORT IDENTIFIER. 3590 */ 3591 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi); 3592 if (!dest_se_deve) { 3593 pr_err("Unable to locate %s dest_se_deve from RTPI:" 3594 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi); 3595 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3596 ret = -EINVAL; 3597 goto out; 3598 } 3599 3600 ret = core_scsi3_lunacl_depend_item(dest_se_deve); 3601 if (ret < 0) { 3602 pr_err("core_scsi3_lunacl_depend_item() failed\n"); 3603 atomic_dec(&dest_se_deve->pr_ref_count); 3604 smp_mb__after_atomic_dec(); 3605 dest_se_deve = NULL; 3606 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3607 ret = -EINVAL; 3608 goto out; 3609 } 3610 3611 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN" 3612 " ACL for dest_se_deve->mapped_lun: %u\n", 3613 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname, 3614 dest_se_deve->mapped_lun); 3615 3616 /* 3617 * A persistent reservation needs to already existing in order to 3618 * successfully complete the REGISTER_AND_MOVE service action.. 3619 */ 3620 spin_lock(&dev->dev_reservation_lock); 3621 pr_res_holder = dev->dev_pr_res_holder; 3622 if (!pr_res_holder) { 3623 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation" 3624 " currently held\n"); 3625 spin_unlock(&dev->dev_reservation_lock); 3626 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3627 ret = -EINVAL; 3628 goto out; 3629 } 3630 /* 3631 * The received on I_T Nexus must be the reservation holder. 3632 * 3633 * From spc4r17 section 5.7.8 Table 50 -- 3634 * Register behaviors for a REGISTER AND MOVE service action 3635 */ 3636 if (pr_res_holder != pr_reg) { 3637 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" 3638 " Nexus is not reservation holder\n"); 3639 spin_unlock(&dev->dev_reservation_lock); 3640 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3641 ret = -EINVAL; 3642 goto out; 3643 } 3644 /* 3645 * From spc4r17 section 5.7.8: registering and moving reservation 3646 * 3647 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service 3648 * action is received and the established persistent reservation is a 3649 * Write Exclusive - All Registrants type or Exclusive Access - 3650 * All Registrants type reservation, then the command shall be completed 3651 * with RESERVATION CONFLICT status. 3652 */ 3653 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 3654 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { 3655 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move" 3656 " reservation for type: %s\n", 3657 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type)); 3658 spin_unlock(&dev->dev_reservation_lock); 3659 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3660 ret = -EINVAL; 3661 goto out; 3662 } 3663 pr_res_nacl = pr_res_holder->pr_reg_nacl; 3664 /* 3665 * b) Ignore the contents of the (received) SCOPE and TYPE fields; 3666 */ 3667 type = pr_res_holder->pr_res_type; 3668 scope = pr_res_holder->pr_res_type; 3669 /* 3670 * c) Associate the reservation key specified in the SERVICE ACTION 3671 * RESERVATION KEY field with the I_T nexus specified as the 3672 * destination of the register and move, where: 3673 * A) The I_T nexus is specified by the TransportID and the 3674 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and 3675 * B) Regardless of the TransportID format used, the association for 3676 * the initiator port is based on either the initiator port name 3677 * (see 3.1.71) on SCSI transport protocols where port names are 3678 * required or the initiator port identifier (see 3.1.70) on SCSI 3679 * transport protocols where port names are not required; 3680 * d) Register the reservation key specified in the SERVICE ACTION 3681 * RESERVATION KEY field; 3682 * e) Retain the reservation key specified in the SERVICE ACTION 3683 * RESERVATION KEY field and associated information; 3684 * 3685 * Also, It is not an error for a REGISTER AND MOVE service action to 3686 * register an I_T nexus that is already registered with the same 3687 * reservation key or a different reservation key. 3688 */ 3689 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3690 iport_ptr); 3691 if (!dest_pr_reg) { 3692 ret = core_scsi3_alloc_registration(cmd->se_dev, 3693 dest_node_acl, dest_se_deve, iport_ptr, 3694 sa_res_key, 0, aptpl, 2, 1); 3695 if (ret != 0) { 3696 spin_unlock(&dev->dev_reservation_lock); 3697 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3698 ret = -EINVAL; 3699 goto out; 3700 } 3701 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl, 3702 iport_ptr); 3703 new_reg = 1; 3704 } 3705 /* 3706 * f) Release the persistent reservation for the persistent reservation 3707 * holder (i.e., the I_T nexus on which the 3708 */ 3709 __core_scsi3_complete_pro_release(dev, pr_res_nacl, 3710 dev->dev_pr_res_holder, 0); 3711 /* 3712 * g) Move the persistent reservation to the specified I_T nexus using 3713 * the same scope and type as the persistent reservation released in 3714 * item f); and 3715 */ 3716 dev->dev_pr_res_holder = dest_pr_reg; 3717 dest_pr_reg->pr_res_holder = 1; 3718 dest_pr_reg->pr_res_type = type; 3719 pr_reg->pr_res_scope = scope; 3720 prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0], 3721 PR_REG_ISID_ID_LEN); 3722 /* 3723 * Increment PRGeneration for existing registrations.. 3724 */ 3725 if (!new_reg) 3726 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++; 3727 spin_unlock(&dev->dev_reservation_lock); 3728 3729 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE" 3730 " created new reservation holder TYPE: %s on object RTPI:" 3731 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(), 3732 core_scsi3_pr_dump_type(type), rtpi, 3733 dest_pr_reg->pr_res_generation); 3734 pr_debug("SPC-3 PR Successfully moved reservation from" 3735 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n", 3736 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname, 3737 (prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(), 3738 dest_node_acl->initiatorname, (iport_ptr != NULL) ? 3739 iport_ptr : ""); 3740 /* 3741 * It is now safe to release configfs group dependencies for destination 3742 * of Transport ID Initiator Device/Port Identifier 3743 */ 3744 core_scsi3_lunacl_undepend_item(dest_se_deve); 3745 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3746 core_scsi3_tpg_undepend_item(dest_se_tpg); 3747 /* 3748 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T 3749 * nexus on which PERSISTENT RESERVE OUT command was received. 3750 */ 3751 if (unreg) { 3752 spin_lock(&pr_tmpl->registration_lock); 3753 __core_scsi3_free_registration(dev, pr_reg, NULL, 1); 3754 spin_unlock(&pr_tmpl->registration_lock); 3755 } else 3756 core_scsi3_put_pr_reg(pr_reg); 3757 3758 /* 3759 * Clear the APTPL metadata if APTPL has been disabled, otherwise 3760 * write out the updated metadata to struct file for this SCSI device. 3761 */ 3762 if (!aptpl) { 3763 pr_tmpl->pr_aptpl_active = 0; 3764 core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); 3765 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" 3766 " REGISTER_AND_MOVE\n"); 3767 } else { 3768 pr_tmpl->pr_aptpl_active = 1; 3769 ret = core_scsi3_update_and_write_aptpl(cmd->se_dev, 3770 &dest_pr_reg->pr_aptpl_buf[0], 3771 pr_tmpl->pr_aptpl_buf_len); 3772 if (!ret) 3773 pr_debug("SPC-3 PR: Set APTPL Bit Activated for" 3774 " REGISTER_AND_MOVE\n"); 3775 } 3776 3777 transport_kunmap_data_sg(cmd); 3778 3779 core_scsi3_put_pr_reg(dest_pr_reg); 3780 return 0; 3781 out: 3782 if (buf) 3783 transport_kunmap_data_sg(cmd); 3784 if (dest_se_deve) 3785 core_scsi3_lunacl_undepend_item(dest_se_deve); 3786 if (dest_node_acl) 3787 core_scsi3_nodeacl_undepend_item(dest_node_acl); 3788 core_scsi3_tpg_undepend_item(dest_se_tpg); 3789 core_scsi3_put_pr_reg(pr_reg); 3790 return ret; 3791 } 3792 3793 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 3794 { 3795 unsigned int __v1, __v2; 3796 3797 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; 3798 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; 3799 3800 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 3801 } 3802 3803 /* 3804 * See spc4r17 section 6.14 Table 170 3805 */ 3806 int target_scsi3_emulate_pr_out(struct se_cmd *cmd) 3807 { 3808 unsigned char *cdb = &cmd->t_task_cdb[0]; 3809 unsigned char *buf; 3810 u64 res_key, sa_res_key; 3811 int sa, scope, type, aptpl; 3812 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0; 3813 int ret; 3814 3815 /* 3816 * Following spc2r20 5.5.1 Reservations overview: 3817 * 3818 * If a logical unit has been reserved by any RESERVE command and is 3819 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 3820 * PERSISTENT RESERVE OUT commands shall conflict regardless of 3821 * initiator or service action and shall terminate with a RESERVATION 3822 * CONFLICT status. 3823 */ 3824 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) { 3825 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 3826 " SPC-2 reservation is held, returning" 3827 " RESERVATION_CONFLICT\n"); 3828 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 3829 ret = -EINVAL; 3830 goto out; 3831 } 3832 3833 /* 3834 * FIXME: A NULL struct se_session pointer means an this is not coming from 3835 * a $FABRIC_MOD's nexus, but from internal passthrough ops. 3836 */ 3837 if (!cmd->se_sess) { 3838 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 3839 ret = -EINVAL; 3840 goto out; 3841 } 3842 3843 if (cmd->data_length < 24) { 3844 pr_warn("SPC-PR: Received PR OUT parameter list" 3845 " length too small: %u\n", cmd->data_length); 3846 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3847 ret = -EINVAL; 3848 goto out; 3849 } 3850 /* 3851 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB) 3852 */ 3853 sa = (cdb[1] & 0x1f); 3854 scope = (cdb[2] & 0xf0); 3855 type = (cdb[2] & 0x0f); 3856 3857 buf = transport_kmap_data_sg(cmd); 3858 /* 3859 * From PERSISTENT_RESERVE_OUT parameter list (payload) 3860 */ 3861 res_key = core_scsi3_extract_reservation_key(&buf[0]); 3862 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]); 3863 /* 3864 * REGISTER_AND_MOVE uses a different SA parameter list containing 3865 * SCSI TransportIDs. 3866 */ 3867 if (sa != PRO_REGISTER_AND_MOVE) { 3868 spec_i_pt = (buf[20] & 0x08); 3869 all_tg_pt = (buf[20] & 0x04); 3870 aptpl = (buf[20] & 0x01); 3871 } else { 3872 aptpl = (buf[17] & 0x01); 3873 unreg = (buf[17] & 0x02); 3874 } 3875 transport_kunmap_data_sg(cmd); 3876 buf = NULL; 3877 3878 /* 3879 * SPEC_I_PT=1 is only valid for Service action: REGISTER 3880 */ 3881 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) { 3882 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3883 ret = -EINVAL; 3884 goto out; 3885 } 3886 3887 /* 3888 * From spc4r17 section 6.14: 3889 * 3890 * If the SPEC_I_PT bit is set to zero, the service action is not 3891 * REGISTER AND MOVE, and the parameter list length is not 24, then 3892 * the command shall be terminated with CHECK CONDITION status, with 3893 * the sense key set to ILLEGAL REQUEST, and the additional sense 3894 * code set to PARAMETER LIST LENGTH ERROR. 3895 */ 3896 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) && 3897 (cmd->data_length != 24)) { 3898 pr_warn("SPC-PR: Received PR OUT illegal parameter" 3899 " list length: %u\n", cmd->data_length); 3900 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; 3901 ret = -EINVAL; 3902 goto out; 3903 } 3904 /* 3905 * (core_scsi3_emulate_pro_* function parameters 3906 * are defined by spc4r17 Table 174: 3907 * PERSISTENT_RESERVE_OUT service actions and valid parameters. 3908 */ 3909 switch (sa) { 3910 case PRO_REGISTER: 3911 ret = core_scsi3_emulate_pro_register(cmd, 3912 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0); 3913 break; 3914 case PRO_RESERVE: 3915 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key); 3916 break; 3917 case PRO_RELEASE: 3918 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key); 3919 break; 3920 case PRO_CLEAR: 3921 ret = core_scsi3_emulate_pro_clear(cmd, res_key); 3922 break; 3923 case PRO_PREEMPT: 3924 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3925 res_key, sa_res_key, 0); 3926 break; 3927 case PRO_PREEMPT_AND_ABORT: 3928 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope, 3929 res_key, sa_res_key, 1); 3930 break; 3931 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: 3932 ret = core_scsi3_emulate_pro_register(cmd, 3933 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1); 3934 break; 3935 case PRO_REGISTER_AND_MOVE: 3936 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key, 3937 sa_res_key, aptpl, unreg); 3938 break; 3939 default: 3940 pr_err("Unknown PERSISTENT_RESERVE_OUT service" 3941 " action: 0x%02x\n", cdb[1] & 0x1f); 3942 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3943 ret = -EINVAL; 3944 break; 3945 } 3946 3947 out: 3948 if (!ret) 3949 target_complete_cmd(cmd, GOOD); 3950 return ret; 3951 } 3952 3953 /* 3954 * PERSISTENT_RESERVE_IN Service Action READ_KEYS 3955 * 3956 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160 3957 */ 3958 static int core_scsi3_pri_read_keys(struct se_cmd *cmd) 3959 { 3960 struct se_device *se_dev = cmd->se_dev; 3961 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 3962 struct t10_pr_registration *pr_reg; 3963 unsigned char *buf; 3964 u32 add_len = 0, off = 8; 3965 3966 if (cmd->data_length < 8) { 3967 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u" 3968 " too small\n", cmd->data_length); 3969 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 3970 return -EINVAL; 3971 } 3972 3973 buf = transport_kmap_data_sg(cmd); 3974 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 3975 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 3976 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 3977 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 3978 3979 spin_lock(&su_dev->t10_pr.registration_lock); 3980 list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list, 3981 pr_reg_list) { 3982 /* 3983 * Check for overflow of 8byte PRI READ_KEYS payload and 3984 * next reservation key list descriptor. 3985 */ 3986 if ((add_len + 8) > (cmd->data_length - 8)) 3987 break; 3988 3989 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 3990 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 3991 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 3992 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 3993 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 3994 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 3995 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 3996 buf[off++] = (pr_reg->pr_res_key & 0xff); 3997 3998 add_len += 8; 3999 } 4000 spin_unlock(&su_dev->t10_pr.registration_lock); 4001 4002 buf[4] = ((add_len >> 24) & 0xff); 4003 buf[5] = ((add_len >> 16) & 0xff); 4004 buf[6] = ((add_len >> 8) & 0xff); 4005 buf[7] = (add_len & 0xff); 4006 4007 transport_kunmap_data_sg(cmd); 4008 4009 return 0; 4010 } 4011 4012 /* 4013 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION 4014 * 4015 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162 4016 */ 4017 static int core_scsi3_pri_read_reservation(struct se_cmd *cmd) 4018 { 4019 struct se_device *se_dev = cmd->se_dev; 4020 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 4021 struct t10_pr_registration *pr_reg; 4022 unsigned char *buf; 4023 u64 pr_res_key; 4024 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ 4025 4026 if (cmd->data_length < 8) { 4027 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" 4028 " too small\n", cmd->data_length); 4029 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4030 return -EINVAL; 4031 } 4032 4033 buf = transport_kmap_data_sg(cmd); 4034 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 4035 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 4036 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 4037 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 4038 4039 spin_lock(&se_dev->dev_reservation_lock); 4040 pr_reg = se_dev->dev_pr_res_holder; 4041 if (pr_reg) { 4042 /* 4043 * Set the hardcoded Additional Length 4044 */ 4045 buf[4] = ((add_len >> 24) & 0xff); 4046 buf[5] = ((add_len >> 16) & 0xff); 4047 buf[6] = ((add_len >> 8) & 0xff); 4048 buf[7] = (add_len & 0xff); 4049 4050 if (cmd->data_length < 22) 4051 goto err; 4052 4053 /* 4054 * Set the Reservation key. 4055 * 4056 * From spc4r17, section 5.7.10: 4057 * A persistent reservation holder has its reservation key 4058 * returned in the parameter data from a PERSISTENT 4059 * RESERVE IN command with READ RESERVATION service action as 4060 * follows: 4061 * a) For a persistent reservation of the type Write Exclusive 4062 * - All Registrants or Exclusive Access All Regitrants, 4063 * the reservation key shall be set to zero; or 4064 * b) For all other persistent reservation types, the 4065 * reservation key shall be set to the registered 4066 * reservation key for the I_T nexus that holds the 4067 * persistent reservation. 4068 */ 4069 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || 4070 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) 4071 pr_res_key = 0; 4072 else 4073 pr_res_key = pr_reg->pr_res_key; 4074 4075 buf[8] = ((pr_res_key >> 56) & 0xff); 4076 buf[9] = ((pr_res_key >> 48) & 0xff); 4077 buf[10] = ((pr_res_key >> 40) & 0xff); 4078 buf[11] = ((pr_res_key >> 32) & 0xff); 4079 buf[12] = ((pr_res_key >> 24) & 0xff); 4080 buf[13] = ((pr_res_key >> 16) & 0xff); 4081 buf[14] = ((pr_res_key >> 8) & 0xff); 4082 buf[15] = (pr_res_key & 0xff); 4083 /* 4084 * Set the SCOPE and TYPE 4085 */ 4086 buf[21] = (pr_reg->pr_res_scope & 0xf0) | 4087 (pr_reg->pr_res_type & 0x0f); 4088 } 4089 4090 err: 4091 spin_unlock(&se_dev->dev_reservation_lock); 4092 transport_kunmap_data_sg(cmd); 4093 4094 return 0; 4095 } 4096 4097 /* 4098 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES 4099 * 4100 * See spc4r17 section 6.13.4 Table 165 4101 */ 4102 static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd) 4103 { 4104 struct se_device *dev = cmd->se_dev; 4105 struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr; 4106 unsigned char *buf; 4107 u16 add_len = 8; /* Hardcoded to 8. */ 4108 4109 if (cmd->data_length < 6) { 4110 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" 4111 " %u too small\n", cmd->data_length); 4112 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4113 return -EINVAL; 4114 } 4115 4116 buf = transport_kmap_data_sg(cmd); 4117 4118 buf[0] = ((add_len << 8) & 0xff); 4119 buf[1] = (add_len & 0xff); 4120 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ 4121 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ 4122 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ 4123 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */ 4124 /* 4125 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so 4126 * set the TMV: Task Mask Valid bit. 4127 */ 4128 buf[3] |= 0x80; 4129 /* 4130 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166 4131 */ 4132 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */ 4133 /* 4134 * PTPL_A: Persistence across Target Power Loss Active bit 4135 */ 4136 if (pr_tmpl->pr_aptpl_active) 4137 buf[3] |= 0x01; 4138 /* 4139 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167 4140 */ 4141 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 4142 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */ 4143 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */ 4144 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */ 4145 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ 4146 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ 4147 4148 transport_kunmap_data_sg(cmd); 4149 4150 return 0; 4151 } 4152 4153 /* 4154 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS 4155 * 4156 * See spc4r17 section 6.13.5 Table 168 and 169 4157 */ 4158 static int core_scsi3_pri_read_full_status(struct se_cmd *cmd) 4159 { 4160 struct se_device *se_dev = cmd->se_dev; 4161 struct se_node_acl *se_nacl; 4162 struct se_subsystem_dev *su_dev = se_dev->se_sub_dev; 4163 struct se_portal_group *se_tpg; 4164 struct t10_pr_registration *pr_reg, *pr_reg_tmp; 4165 struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr; 4166 unsigned char *buf; 4167 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len; 4168 u32 off = 8; /* off into first Full Status descriptor */ 4169 int format_code = 0; 4170 4171 if (cmd->data_length < 8) { 4172 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u" 4173 " too small\n", cmd->data_length); 4174 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4175 return -EINVAL; 4176 } 4177 4178 buf = transport_kmap_data_sg(cmd); 4179 4180 buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff); 4181 buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff); 4182 buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff); 4183 buf[3] = (su_dev->t10_pr.pr_generation & 0xff); 4184 4185 spin_lock(&pr_tmpl->registration_lock); 4186 list_for_each_entry_safe(pr_reg, pr_reg_tmp, 4187 &pr_tmpl->registration_list, pr_reg_list) { 4188 4189 se_nacl = pr_reg->pr_reg_nacl; 4190 se_tpg = pr_reg->pr_reg_nacl->se_tpg; 4191 add_desc_len = 0; 4192 4193 atomic_inc(&pr_reg->pr_res_holders); 4194 smp_mb__after_atomic_inc(); 4195 spin_unlock(&pr_tmpl->registration_lock); 4196 /* 4197 * Determine expected length of $FABRIC_MOD specific 4198 * TransportID full status descriptor.. 4199 */ 4200 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len( 4201 se_tpg, se_nacl, pr_reg, &format_code); 4202 4203 if ((exp_desc_len + add_len) > cmd->data_length) { 4204 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran" 4205 " out of buffer: %d\n", cmd->data_length); 4206 spin_lock(&pr_tmpl->registration_lock); 4207 atomic_dec(&pr_reg->pr_res_holders); 4208 smp_mb__after_atomic_dec(); 4209 break; 4210 } 4211 /* 4212 * Set RESERVATION KEY 4213 */ 4214 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); 4215 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); 4216 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); 4217 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); 4218 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); 4219 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); 4220 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); 4221 buf[off++] = (pr_reg->pr_res_key & 0xff); 4222 off += 4; /* Skip Over Reserved area */ 4223 4224 /* 4225 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set. 4226 */ 4227 if (pr_reg->pr_reg_all_tg_pt) 4228 buf[off] = 0x02; 4229 /* 4230 * The struct se_lun pointer will be present for the 4231 * reservation holder for PR_HOLDER bit. 4232 * 4233 * Also, if this registration is the reservation 4234 * holder, fill in SCOPE and TYPE in the next byte. 4235 */ 4236 if (pr_reg->pr_res_holder) { 4237 buf[off++] |= 0x01; 4238 buf[off++] = (pr_reg->pr_res_scope & 0xf0) | 4239 (pr_reg->pr_res_type & 0x0f); 4240 } else 4241 off += 2; 4242 4243 off += 4; /* Skip over reserved area */ 4244 /* 4245 * From spc4r17 6.3.15: 4246 * 4247 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT 4248 * IDENTIFIER field contains the relative port identifier (see 4249 * 3.1.120) of the target port that is part of the I_T nexus 4250 * described by this full status descriptor. If the ALL_TG_PT 4251 * bit is set to one, the contents of the RELATIVE TARGET PORT 4252 * IDENTIFIER field are not defined by this standard. 4253 */ 4254 if (!pr_reg->pr_reg_all_tg_pt) { 4255 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep; 4256 4257 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 4258 buf[off++] = (port->sep_rtpi & 0xff); 4259 } else 4260 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */ 4261 4262 /* 4263 * Now, have the $FABRIC_MOD fill in the protocol identifier 4264 */ 4265 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg, 4266 se_nacl, pr_reg, &format_code, &buf[off+4]); 4267 4268 spin_lock(&pr_tmpl->registration_lock); 4269 atomic_dec(&pr_reg->pr_res_holders); 4270 smp_mb__after_atomic_dec(); 4271 /* 4272 * Set the ADDITIONAL DESCRIPTOR LENGTH 4273 */ 4274 buf[off++] = ((desc_len >> 24) & 0xff); 4275 buf[off++] = ((desc_len >> 16) & 0xff); 4276 buf[off++] = ((desc_len >> 8) & 0xff); 4277 buf[off++] = (desc_len & 0xff); 4278 /* 4279 * Size of full desctipor header minus TransportID 4280 * containing $FABRIC_MOD specific) initiator device/port 4281 * WWN information. 4282 * 4283 * See spc4r17 Section 6.13.5 Table 169 4284 */ 4285 add_desc_len = (24 + desc_len); 4286 4287 off += desc_len; 4288 add_len += add_desc_len; 4289 } 4290 spin_unlock(&pr_tmpl->registration_lock); 4291 /* 4292 * Set ADDITIONAL_LENGTH 4293 */ 4294 buf[4] = ((add_len >> 24) & 0xff); 4295 buf[5] = ((add_len >> 16) & 0xff); 4296 buf[6] = ((add_len >> 8) & 0xff); 4297 buf[7] = (add_len & 0xff); 4298 4299 transport_kunmap_data_sg(cmd); 4300 4301 return 0; 4302 } 4303 4304 int target_scsi3_emulate_pr_in(struct se_cmd *cmd) 4305 { 4306 int ret; 4307 4308 /* 4309 * Following spc2r20 5.5.1 Reservations overview: 4310 * 4311 * If a logical unit has been reserved by any RESERVE command and is 4312 * still reserved by any initiator, all PERSISTENT RESERVE IN and all 4313 * PERSISTENT RESERVE OUT commands shall conflict regardless of 4314 * initiator or service action and shall terminate with a RESERVATION 4315 * CONFLICT status. 4316 */ 4317 if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) { 4318 pr_err("Received PERSISTENT_RESERVE CDB while legacy" 4319 " SPC-2 reservation is held, returning" 4320 " RESERVATION_CONFLICT\n"); 4321 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 4322 return -EINVAL; 4323 } 4324 4325 switch (cmd->t_task_cdb[1] & 0x1f) { 4326 case PRI_READ_KEYS: 4327 ret = core_scsi3_pri_read_keys(cmd); 4328 break; 4329 case PRI_READ_RESERVATION: 4330 ret = core_scsi3_pri_read_reservation(cmd); 4331 break; 4332 case PRI_REPORT_CAPABILITIES: 4333 ret = core_scsi3_pri_report_capabilities(cmd); 4334 break; 4335 case PRI_READ_FULL_STATUS: 4336 ret = core_scsi3_pri_read_full_status(cmd); 4337 break; 4338 default: 4339 pr_err("Unknown PERSISTENT_RESERVE_IN service" 4340 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); 4341 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 4342 ret = -EINVAL; 4343 break; 4344 } 4345 4346 if (!ret) 4347 target_complete_cmd(cmd, GOOD); 4348 return ret; 4349 } 4350 4351 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type) 4352 { 4353 return 0; 4354 } 4355 4356 static int core_pt_seq_non_holder( 4357 struct se_cmd *cmd, 4358 unsigned char *cdb, 4359 u32 pr_reg_type) 4360 { 4361 return 0; 4362 } 4363 4364 int core_setup_reservations(struct se_device *dev, int force_pt) 4365 { 4366 struct se_subsystem_dev *su_dev = dev->se_sub_dev; 4367 struct t10_reservation *rest = &su_dev->t10_pr; 4368 /* 4369 * If this device is from Target_Core_Mod/pSCSI, use the reservations 4370 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can 4371 * cause a problem because libata and some SATA RAID HBAs appear 4372 * under Linux/SCSI, but to emulate reservations themselves. 4373 */ 4374 if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && 4375 !(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) { 4376 rest->res_type = SPC_PASSTHROUGH; 4377 rest->pr_ops.t10_reservation_check = &core_pt_reservation_check; 4378 rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder; 4379 pr_debug("%s: Using SPC_PASSTHROUGH, no reservation" 4380 " emulation\n", dev->transport->name); 4381 return 0; 4382 } 4383 /* 4384 * If SPC-3 or above is reported by real or emulated struct se_device, 4385 * use emulated Persistent Reservations. 4386 */ 4387 if (dev->transport->get_device_rev(dev) >= SCSI_3) { 4388 rest->res_type = SPC3_PERSISTENT_RESERVATIONS; 4389 rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check; 4390 rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder; 4391 pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS" 4392 " emulation\n", dev->transport->name); 4393 } else { 4394 rest->res_type = SPC2_RESERVATIONS; 4395 rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check; 4396 rest->pr_ops.t10_seq_non_holder = 4397 &core_scsi2_reservation_seq_non_holder; 4398 pr_debug("%s: Using SPC2_RESERVATIONS emulation\n", 4399 dev->transport->name); 4400 } 4401 4402 return 0; 4403 } 4404